blackwood vs blackwood tree

blackwood and blackwood tree both are nouns.

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

As nouns, blackwood and blackwood tree are synonyms defined as:

blackwood and blackwood tree: any of several hardwood trees yielding very dark-colored wood

blackwood (noun)	blackwood tree (noun)
any of several hardwood trees yielding very dark-colored wood	any of several hardwood trees yielding very dark-colored wood
very dark wood of any of several blackwood trees