bitter floom vs marsh pink

bitter floom and marsh pink both are nouns.

Word	Noun	Adjective	Verb	Adverb
bitter floom	Yes	No	No	No
marsh pink	Yes	No	No	No

As nouns, bitter floom and marsh pink are synonyms defined as:

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

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

bitter floom (noun)	marsh 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