Calidris vs bird genus

Calidris and bird genus both are nouns.

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

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

Calidris: a genus of Scolopacidae, containing the knots and the surfbirds (Calidris)
bird genus: a genus of birds

Calidris (noun)	bird genus (noun)
a genus of Scolopacidae, containing the knots and the surfbirds (Calidris)	a genus of birds