Macrocephalon maleo vs megapode

Macrocephalon maleo and megapode both are nouns.

Word	Noun	Adjective	Verb	Adverb
Macrocephalon maleo	Yes	No	No	No
megapode	Yes	No	No	No

As nouns, megapode is a hypernym of Macrocephalon maleo; that is, megapode is a word with a broader meaning than Macrocephalon maleo:

Macrocephalon maleo: Celebes megapode that lays eggs in holes in sandy beaches
megapode: large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs

Other hypernyms of Macrocephalon maleo include mound-bird, mound bird, mound builder, scrub fowl.

Macrocephalon maleo (noun)	megapode (noun)
Celebes megapode that lays eggs in holes in sandy beaches	large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs