Struthio camelus vs ratite

Struthio camelus and ratite both are nouns.

Word	Noun	Adjective	Verb	Adverb
Struthio camelus	Yes	No	No	No
ratite	Yes	No	No	No

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

Struthio camelus: fast-running African flightless bird with two-toed feet; largest living bird
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 Struthio camelus include flightless bird, ratite bird.

Struthio camelus (noun)	ratite (noun)
fast-running African flightless bird with two-toed feet; largest living bird	flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches, cassowaries, emus, moas, rheas, kiwis, elephant birds