aepyornis vs ratite

aepyornis and ratite both are nouns.

Word	Noun	Adjective	Verb	Adverb
aepyornis	Yes	No	No	No
ratite	Yes	No	No	No

As nouns, ratite is a hypernym of aepyornis; that is, ratite is a word with a broader meaning than aepyornis:

aepyornis: huge (to 9 ft.) extinct flightless bird of Madagascar
ratite: flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches, cassowaries, emus, moas, rheas, kiwis, elephant birds

Other hypernyms of aepyornis include flightless bird, ratite bird.

aepyornis (noun)	ratite (noun)
huge (to 9 ft.) extinct flightless bird of Madagascar	flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches, cassowaries, emus, moas, rheas, kiwis, elephant birds