megapode vs mound builder

megapode and mound builder both are nouns.

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

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

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

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

megapode (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