mound-bird vs gallinaceous bird

mound-bird and gallinaceous bird both are nouns.

Word	Noun	Adjective	Verb	Adverb
mound-bird	Yes	No	No	No
gallinaceous bird	Yes	No	No	No

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

mound-bird: large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs
gallinaceous bird: heavy-bodied largely ground-feeding domestic or game birds

Other hypernyms of mound-bird include gallinacean.

mound-bird (noun)	gallinaceous bird (noun)
large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs	heavy-bodied largely ground-feeding domestic or game birds