this was taken from ed roman's site. and there are different kinds of wood outthere as well.
Standard Woods In Use By Most Companies
Mahogany
Mahogany is a moderately dense and very durable wood. It is commonly used for the backs, sides and necks of acoustic guitars. It is sometimes used on electric guitar bodies and necks. Because it is very sonorous and durable, mahogany is also used in banjos, resonators, ukuleles and acoustic guitar soundboards. It is lighter than maple and specifically provides acoustic guitars with great sustain. Mahogany also provides great weight balance between the neck and the body of an acoustic. It is reddish-brown in color and is incredibly strong and resonant, giving the guitar big, beautiful tones.
We don't use to much mahogany at Ed Roman's simply because we are known as an exotic builder. People generally expect something a little more exotic from us
Koa Wood
Koa is a gorgeous wood with well defined curly and flamed grain patterns as found in instrument quality Maple. It falls in the middle of the tonal spectrum, giving the instrument a brightness of tone without sacrificing warmth. It is slightly less round in tone than the rosewoods. We have been building custom Koa guitars for close to 20 years.
Alder
We find that alder has the richest tone, characterized by lots of fat low-end, well defined mid ranges and a lot of sustain. Alder is a light wood, which makes it more comfortable for lengthy gigs. It is one of the original woods used for solid body guitars. Although other manufacturers use woods like poplar and basswood, they are considered alder substitutes. We don't use to much Alder at Ed Roman's simply because we are known as an exotic builder. People generally expect something a little more exotic from us
Solid Alder
Solid Alder is a fairly light and incredibly resilient wood that is a favorite amongst electric guitar makers. It is a close-grained wood with a naturally light tan color. Alder is mostly used for electric guitar bodybuilding because of its full sound, great sustain and density. It is a porous wood that takes quite well to a variety of finishes. This gives the guitar a richer sound because the solid wood soundboard can vibrate more freely & thoroughly.
Spruce
Spruce is the most commonly used wood on acoustic guitar soundboards. The soundboards on acoustics are generally made of tightly grained spruce. Naturally yellow in color, spruce is a lightwood that has a very high degree of resonance, so it is a perfect match for acoustic guitars.
Solid Spruce
Solid spruce refers less to a difference in the wood than to how it is actually cut for the guitar. Laminate spruce soundboards are built as layers of cross-grained wood glued to each other. Solid spruce soundboards consist of one piece of wood running all the way through. This gives the guitar a richer sound because the solid wood soundboard can vibrate more freely and thoroughly.
Canadian Sitka Spruce
is a harder to find, more expensive variety of spruce. It has a light yellow color and is also used for acoustic guitar soundboards. It gives guitars a bigger more resonant sound, flush with crisp highs. It also improves with age more than other types of spruce.
German Spruce
This increasingly rare wood has a higher weight to strength ratio than Sitka and correspondingly complements the brightness and clarity of the guitars.
Maple
Maple is a strong and extremely dense, heavy wood. It is excellent for guitar necks and bodies because it can handle an inordinate amount of string tension. Maple has a bright and crisp tone and is used on flamenco guitars as well as some electrics. It has a wide variety of exotic grains that show up quite well when finished. Flamed maple is a very popular and brilliant looking exotic type of maple. "Flamed" refers to the rippling, or curls of the grain of wood that run across the body. Flamed maple in generally "book matched," which means that the body is made of two half pieces of a single cut piece of maple. This gives the guitar even weight, look and tone throughout the body.
Cedar
Many companies use Cedar or some type of redwood specifically for fingerstyle instruments as it responds quickly and with good volume to a light attack. It is also very well suited to open or lowered tension tunings as they require the same qualities for good separation and definition. Cedar does lose tonal integrity when over driven, making it a poor choice for versatility but an excellent top wood for showcasing finger styles.
Brazilian Rosewood
Highly sought after by generations of luthiers and players for its unmatched beauty. Brazilian helps to impart warmth and darkness to the tone of the guitar. Tonal differences between Brazilian and Indian Rosewoods are subtle and consideration should be based on aesthetics, rarity, future value, and collectibility.
Indian Rosewood
Like Brazilian, Indian Rosewood keeps the guitar at the warm dark end of the tonal spectrum. While not as visually striking as Brazilian, Indian Rosewood has an elegant appearance and should not be considered inferior to Brazilian on any account. Just the same we never ever use it !!!! For fingerboards we use ebony, pau ferro or at very least Madagascar rosewood which is much more stunning than the plain old Indian rosewood.
Nato
Nato wood, also known as Eastern Mahogany, is a reliable, strong wood used on low cost guitar necks. It is a value-priced wood used more for beginner instruments. However, it still embodies some of the properties of more commonly used mahogany. While we would never use this wood on one of our custom guitars, We do carry several low end $100.00 & $200.00 guitars that are made from it.
Standard Woods In Use By Most Companies
Mahogany
Mahogany is a moderately dense and very durable wood. It is commonly used for the backs, sides and necks of acoustic guitars. It is sometimes used on electric guitar bodies and necks. Because it is very sonorous and durable, mahogany is also used in banjos, resonators, ukuleles and acoustic guitar soundboards. It is lighter than maple and specifically provides acoustic guitars with great sustain. Mahogany also provides great weight balance between the neck and the body of an acoustic. It is reddish-brown in color and is incredibly strong and resonant, giving the guitar big, beautiful tones.
We don't use to much mahogany at Ed Roman's simply because we are known as an exotic builder. People generally expect something a little more exotic from us
Koa Wood
Koa is a gorgeous wood with well defined curly and flamed grain patterns as found in instrument quality Maple. It falls in the middle of the tonal spectrum, giving the instrument a brightness of tone without sacrificing warmth. It is slightly less round in tone than the rosewoods. We have been building custom Koa guitars for close to 20 years.
Alder
We find that alder has the richest tone, characterized by lots of fat low-end, well defined mid ranges and a lot of sustain. Alder is a light wood, which makes it more comfortable for lengthy gigs. It is one of the original woods used for solid body guitars. Although other manufacturers use woods like poplar and basswood, they are considered alder substitutes. We don't use to much Alder at Ed Roman's simply because we are known as an exotic builder. People generally expect something a little more exotic from us
Solid Alder
Solid Alder is a fairly light and incredibly resilient wood that is a favorite amongst electric guitar makers. It is a close-grained wood with a naturally light tan color. Alder is mostly used for electric guitar bodybuilding because of its full sound, great sustain and density. It is a porous wood that takes quite well to a variety of finishes. This gives the guitar a richer sound because the solid wood soundboard can vibrate more freely & thoroughly.
Spruce
Spruce is the most commonly used wood on acoustic guitar soundboards. The soundboards on acoustics are generally made of tightly grained spruce. Naturally yellow in color, spruce is a lightwood that has a very high degree of resonance, so it is a perfect match for acoustic guitars.
Solid Spruce
Solid spruce refers less to a difference in the wood than to how it is actually cut for the guitar. Laminate spruce soundboards are built as layers of cross-grained wood glued to each other. Solid spruce soundboards consist of one piece of wood running all the way through. This gives the guitar a richer sound because the solid wood soundboard can vibrate more freely and thoroughly.
Canadian Sitka Spruce
is a harder to find, more expensive variety of spruce. It has a light yellow color and is also used for acoustic guitar soundboards. It gives guitars a bigger more resonant sound, flush with crisp highs. It also improves with age more than other types of spruce.
German Spruce
This increasingly rare wood has a higher weight to strength ratio than Sitka and correspondingly complements the brightness and clarity of the guitars.
Maple
Maple is a strong and extremely dense, heavy wood. It is excellent for guitar necks and bodies because it can handle an inordinate amount of string tension. Maple has a bright and crisp tone and is used on flamenco guitars as well as some electrics. It has a wide variety of exotic grains that show up quite well when finished. Flamed maple is a very popular and brilliant looking exotic type of maple. "Flamed" refers to the rippling, or curls of the grain of wood that run across the body. Flamed maple in generally "book matched," which means that the body is made of two half pieces of a single cut piece of maple. This gives the guitar even weight, look and tone throughout the body.
Cedar
Many companies use Cedar or some type of redwood specifically for fingerstyle instruments as it responds quickly and with good volume to a light attack. It is also very well suited to open or lowered tension tunings as they require the same qualities for good separation and definition. Cedar does lose tonal integrity when over driven, making it a poor choice for versatility but an excellent top wood for showcasing finger styles.
Brazilian Rosewood
Highly sought after by generations of luthiers and players for its unmatched beauty. Brazilian helps to impart warmth and darkness to the tone of the guitar. Tonal differences between Brazilian and Indian Rosewoods are subtle and consideration should be based on aesthetics, rarity, future value, and collectibility.
Indian Rosewood
Like Brazilian, Indian Rosewood keeps the guitar at the warm dark end of the tonal spectrum. While not as visually striking as Brazilian, Indian Rosewood has an elegant appearance and should not be considered inferior to Brazilian on any account. Just the same we never ever use it !!!! For fingerboards we use ebony, pau ferro or at very least Madagascar rosewood which is much more stunning than the plain old Indian rosewood.
Nato
Nato wood, also known as Eastern Mahogany, is a reliable, strong wood used on low cost guitar necks. It is a value-priced wood used more for beginner instruments. However, it still embodies some of the properties of more commonly used mahogany. While we would never use this wood on one of our custom guitars, We do carry several low end $100.00 & $200.00 guitars that are made from it.
and check this site out as well:
http://www.warmoth.com/guitar/options/options_bodywoods.cfm