Struthio vs bird genus

Struthio and bird genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Struthio	Yes	No	No	No
bird genus	Yes	No	No	No

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

Struthio (noun)	bird genus (noun)
type genus of the Struthionidae: African ostriches	a genus of birds