bitter floom vs rose pink

bitter floom and rose pink both are nouns.

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

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

bitter floom and rose 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, marsh pink, Sabbatia Angularis, Sabbatia stellaris.

bitter floom (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