Sitta canadensis vs nuthatch

Sitta canadensis and nuthatch both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sitta canadensis	Yes	No	No	No
nuthatch	Yes	No	No	No

As nouns, nuthatch is a hypernym of Sitta canadensis; that is, nuthatch is a word with a broader meaning than Sitta canadensis:

Sitta canadensis: bluish-grey nuthatch with reddish breast; of northern coniferous forests
nuthatch: any of various small short-tailed songbirds with strong feet and a sharp beak that feed on small nuts and insects

Other hypernyms of Sitta canadensis include nutcracker.

Sitta canadensis (noun)	nuthatch (noun)
bluish-grey nuthatch with reddish breast; of northern coniferous forests	any of various small short-tailed songbirds with strong feet and a sharp beak that feed on small nuts and insects