gallinacean vs gallinaceous bird

gallinacean and gallinaceous bird both are nouns.

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

As nouns, gallinacean and gallinaceous bird are synonyms defined as:

gallinacean and gallinaceous bird: heavy-bodied largely ground-feeding domestic or game birds

gallinacean (noun)	gallinaceous bird (noun)
heavy-bodied largely ground-feeding domestic or game birds	heavy-bodied largely ground-feeding domestic or game birds