stinkbird vs gallinacean

stinkbird and gallinacean both are nouns.

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

As nouns, gallinacean is a hypernym of stinkbird; that is, gallinacean is a word with a broader meaning than stinkbird:

stinkbird: crested ill-smelling South American bird whose young have claws on the first and second digits of the wings
gallinacean: heavy-bodied largely ground-feeding domestic or game birds

Other hypernyms of stinkbird include gallinaceous bird.

stinkbird (noun)	gallinacean (noun)
crested ill-smelling South American bird whose young have claws on the first and second digits of the wings	heavy-bodied largely ground-feeding domestic or game birds