mound bird vs mound builder

mound bird and mound builder both are nouns.

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

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

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

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

mound bird (noun)	mound builder (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