redwood vs wood

redwood and wood both are nouns.

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

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

redwood (noun)	wood (noun)
the soft reddish wood of either of two species of sequoia trees	any wind instrument other than the brass instruments
either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae	a golf club with a long shaft used to hit long shots; originally made with a wooden head
wood of either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae	the trees and other plants in a large densely wooded area
	the hard fibrous lignified substance under the bark of trees