Certhia americana vs American creeper

Certhia americana and American creeper both are nouns.

Word	Noun	Adjective	Verb	Adverb
Certhia americana	Yes	No	No	No
American creeper	Yes	No	No	No

As nouns, Certhia americana and American creeper are synonyms defined as:

Certhia americana and American creeper: a common creeper in North America with a down-curved bill

Other synonyms of Certhia americana include brown creeper.

Certhia americana (noun)	American creeper (noun)
a common creeper in North America with a down-curved bill	a common creeper in North America with a down-curved bill