white-breasted nuthatch vs Sitta carolinensis

white-breasted nuthatch and Sitta carolinensis both are nouns.

Word	Noun	Adjective	Verb	Adverb
white-breasted nuthatch	Yes	No	No	No
Sitta carolinensis	Yes	No	No	No

As nouns, white-breasted nuthatch and Sitta carolinensis are synonyms defined as:

white-breasted nuthatch and Sitta carolinensis: bluish-grey nuthatch with black head and white breast; of eastern North America

white-breasted nuthatch (noun)	Sitta carolinensis (noun)
bluish-grey nuthatch with black head and white breast; of eastern North America	bluish-grey nuthatch with black head and white breast; of eastern North America