cassowary vs ratite

cassowary and ratite both are nouns.

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

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

cassowary: large black flightless bird of Australia and New Guinea having a horny head crest
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 cassowary include flightless bird, ratite bird.

cassowary (noun)	ratite (noun)
large black flightless bird of Australia and New Guinea having a horny head crest	flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches, cassowaries, emus, moas, rheas, kiwis, elephant birds