mound builder vs maleo

mound builder and maleo both are nouns.

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

As nouns, maleo is a hyponym of mound builder; that is, maleo is a word with a more specific, narrower meaning than mound builder:

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

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