Emu novaehollandiae vs ratite

Emu novaehollandiae and ratite both are nouns.

Word	Noun	Adjective	Verb	Adverb
Emu novaehollandiae	Yes	No	No	No
ratite	Yes	No	No	No

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

Emu novaehollandiae: large Australian flightless bird similar to the ostrich but smaller
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 Emu novaehollandiae include flightless bird, ratite bird.

Emu novaehollandiae (noun)	ratite (noun)
large Australian flightless bird similar to the ostrich but smaller	flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches, cassowaries, emus, moas, rheas, kiwis, elephant birds