poultry vs gallinaceous bird

poultry and gallinaceous bird both are nouns.

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

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

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

Other hypernyms of poultry include gallinacean.

poultry (noun)	gallinaceous bird (noun)
a domesticated gallinaceous bird thought to be descended from the red jungle fowl	heavy-bodied largely ground-feeding domestic or game birds
flesh of chickens or turkeys or ducks or geese raised for food