metal wood vs wood

metal wood and wood both are nouns.

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

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

metal wood: golf wood with a metal head instead of the traditional wooden head
wood: a golf club with a long shaft used to hit long shots; originally made with a wooden head

metal wood (noun)	wood (noun)
golf wood with a metal head instead of the traditional wooden head	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	a golf club with a long shaft used to hit long shots; originally made with a wooden head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