mound builder vs megapode

mound builder and megapode both are nouns.

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

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

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

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

mound builder (noun)	megapode (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