Picumnus vs bird genus

Picumnus and bird genus both are nouns.

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

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

Picumnus (noun)	bird genus (noun)
a genus of Picidae containing the piculets (Picumnus)	a genus of birds