rainforest vs wood

rainforest and wood both are nouns.

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

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

Other hypernyms of rainforest include forest, woods.

rainforest (noun)	wood (noun)
a forest with heavy annual rainfall	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	a golf club with a long shaft used to hit long shots; originally made with a wooden head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