Struthio camelus vs ratite bird

Struthio camelus and ratite bird both are nouns.

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

As nouns, ratite bird is a hypernym of Struthio camelus; that is, ratite bird 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 bird: 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.

Struthio camelus (noun)	ratite bird (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