marsh pink vs rose pink

marsh pink and rose pink both are nouns.

Word	Noun	Adjective	Verb	Adverb
marsh pink	Yes	No	No	No
rose pink	Yes	No	No	No

As nouns, marsh pink and rose pink are synonyms defined as:

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

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

marsh pink (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