brierwood vs wood

brierwood and wood both are nouns.

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

As nouns, wood is a hypernym of brierwood; that is, wood is a word with a broader meaning than brierwood:

brierwood: wood from the hard woody root of the briar Erica arborea; used to make tobacco pipes
wood: the hard fibrous lignified substance under the bark of trees

brierwood (noun)	wood (noun)
wood from the hard woody root of the briar Erica arborea; used to make tobacco pipes	any wind instrument other than the brass instruments
	a golf club with a long shaft used to hit long shots; originally made with a wooden head
	the trees and other plants in a large densely wooded area
	the hard fibrous lignified substance under the bark of trees