fowl vs gallinacean

fowl and gallinacean both are nouns.

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

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

fowl: a domesticated gallinaceous bird thought to be descended from the red jungle fowl
gallinacean: heavy-bodied largely ground-feeding domestic or game birds

Other hypernyms of fowl include gallinaceous bird.

fowl (noun)	gallinacean (noun)
a domesticated gallinaceous bird thought to be descended from the red jungle fowl	heavy-bodied largely ground-feeding domestic or game birds
the flesh of a bird or fowl (wild or domestic) used as food

fowl (verb)	gallinacean (verb)
hunt fowl in the forest
hunt fowl