Cacatua vs bird genus

Cacatua and bird genus both are nouns.

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

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

Cacatua: a genus of Psittacidae containing the cockatoos, found from the Philippines and Wallacea east to the Solomon Islands and south to Australia (Kakatoe, Cacatua)
bird genus: a genus of birds

Cacatua (noun)	bird genus (noun)
a genus of Psittacidae containing the cockatoos, found from the Philippines and Wallacea east to the Solomon Islands and south to Australia (Kakatoe, Cacatua)	a genus of birds