brown creeper vs American creeper

brown creeper and American creeper both are nouns.

Word	Noun	Adjective	Verb	Adverb
brown creeper	Yes	No	No	No
American creeper	Yes	No	No	No

As nouns, brown creeper and American creeper are synonyms defined as:

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

Other synonyms of brown creeper include Certhia americana.

brown creeper (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