wood vs grove

wood and grove both are nouns.

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

As nouns, grove is a hyponym of wood; that is, grove is a word with a more specific, narrower meaning than wood:

wood (noun)	grove (noun)
any wind instrument other than the brass instruments	garden consisting of a small cultivated wood without undergrowth
a golf club with a long shaft used to hit long shots; originally made with a wooden head	a small growth of trees without underbrush
the trees and other plants in a large densely wooded area
the hard fibrous lignified substance under the bark of trees