American columbo vs columbo

American columbo and columbo both are nouns.

Word	Noun	Adjective	Verb	Adverb
American columbo	Yes	No	No	No
columbo	Yes	No	No	No

As nouns, American columbo and columbo are synonyms defined as:

American columbo and columbo: any of various tall perennial herbs constituting the genus Frasera; widely distributed in warm dry upland areas of California, Oregon, and Washington

Other synonyms of American columbo include American gentian, deer's-ear, deer's-ears, pyramid plant.

American columbo (noun)	columbo (noun)
any of various tall perennial herbs constituting the genus Frasera; widely distributed in warm dry upland areas of California, Oregon, and Washington	any of various tall perennial herbs constituting the genus Frasera; widely distributed in warm dry upland areas of California, Oregon, and Washington