American centaury vs Sabbatia stellaris

American centaury and Sabbatia stellaris both are nouns.

Word	Noun	Adjective	Verb	Adverb
American centaury	Yes	No	No	No
Sabbatia stellaris	Yes	No	No	No

As nouns, American centaury and Sabbatia stellaris are synonyms defined as:

American centaury and Sabbatia stellaris: 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, rose pink, Sabbatia Angularis.

American centaury (noun)	Sabbatia stellaris (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