mound builder vs mound-bird

mound builder and mound-bird both are nouns.

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

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

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

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

mound builder (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