guan vs gallinacean

guan and gallinacean both are nouns.

Word	Noun	Adjective	Verb	Adverb
guan	Yes	No	No	No
gallinacean	Yes	No	No	No

As nouns, gallinacean is a hypernym of guan; that is, gallinacean 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
gallinacean: heavy-bodied largely ground-feeding domestic or game birds

Other hypernyms of guan include gallinaceous bird.

guan (noun)	gallinacean (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