rainbow pink vs china pink

rainbow pink and china pink both are nouns.

Word	Noun	Adjective	Verb	Adverb
rainbow pink	Yes	No	No	No
china pink	Yes	No	No	No

As nouns, rainbow pink and china pink are synonyms defined as:

rainbow pink and china pink: Chinese pink with deeply toothed rose-lilac flowers with a purplish eye; usually raised as an annual

Other synonyms of rainbow pink include Dianthus chinensis.

rainbow pink (noun)	china pink (noun)
Chinese pink with deeply toothed rose-lilac flowers with a purplish eye; usually raised as an annual	Chinese pink with deeply toothed rose-lilac flowers with a purplish eye; usually raised as an annual