wood vs reed

wood and reed both are nouns.

Word	Noun	Adjective	Verb	Adverb
wood	Yes	No	No	No
reed	Yes	No	No	No

As nouns, reed is a hyponym of wood; that is, reed is a word with a more specific, narrower meaning than wood:

Other hyponyms of wood include beating-reed instrument, reed instrument, flute, transverse flute.

wood (noun)	reed (noun)
any wind instrument other than the brass instruments	a musical instrument that sounds by means of a vibrating reed
a golf club with a long shaft used to hit long shots; originally made with a wooden head	a vibrator consisting of a thin strip of stiff material that vibrates to produce a tone when air streams over it
the trees and other plants in a large densely wooded area	tall woody perennial grasses with hollow slender stems especially of the genera Arundo and Phragmites
the hard fibrous lignified substance under the bark of trees