tinamou vs game bird

tinamou and game bird both are nouns.

Word	Noun	Adjective	Verb	Adverb
tinamou	Yes	No	No	No
game bird	Yes	No	No	No

As nouns, game bird is a hypernym of tinamou; that is, game bird is a word with a broader meaning than tinamou:

tinamou: heavy-bodied small-winged South American game bird resembling a gallinaceous bird but related to the ratite birds
game bird: any bird (as grouse or pheasant) that is hunted for sport

tinamou (noun)	game bird (noun)
heavy-bodied small-winged South American game bird resembling a gallinaceous bird but related to the ratite birds	any bird (as grouse or pheasant) that is hunted for sport