American centaury vs rose pink

American centaury and rose pink both are nouns.

Word	Noun	Adjective	Verb	Adverb
American centaury	Yes	No	No	No
rose pink	Yes	No	No	No

As nouns, American centaury and rose pink are synonyms defined as:

American centaury and rose pink: any of several pink-flowered marsh plant of the eastern United States resembling a true centaury

Other synonyms of American centaury include bitter floom, marsh pink, Sabbatia Angularis, Sabbatia stellaris.

American centaury (noun)	rose pink (noun)
any of several pink-flowered marsh plant of the eastern United States resembling a true centaury	any of several pink-flowered marsh plant of the eastern United States resembling a true centaury