mound bird vs mound-bird

mound bird and mound-bird both are nouns.

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

As nouns, mound bird and mound-bird are synonyms defined as:

mound bird and mound-bird: large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs

Other synonyms of mound bird include megapode, mound builder, scrub fowl.

mound bird (noun)	mound-bird (noun)
large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs	large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs