blackwood vs wood

blackwood and wood both are nouns.

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

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

blackwood (noun)	wood (noun)
any of several hardwood trees yielding very dark-colored wood	any wind instrument other than the brass instruments
very dark wood of any of several blackwood trees	a golf club with a long shaft used to hit long shots; originally made with a wooden head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