guan vs gallinaceous bird

guan and gallinaceous bird both are nouns.

Word	Noun	Adjective	Verb	Adverb
guan	Yes	No	No	No
gallinaceous bird	Yes	No	No	No

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

guan: any of several large turkey-like game birds of the family Cracidae; native to jungles of tropical America; resembling the curassows and valued as food
gallinaceous bird: heavy-bodied largely ground-feeding domestic or game birds

Other hypernyms of guan include gallinacean.

guan (noun)	gallinaceous bird (noun)
any of several large turkey-like game birds of the family Cracidae; native to jungles of tropical America; resembling the curassows and valued as food	heavy-bodied largely ground-feeding domestic or game birds