grass pink vs Dianthus plumarius

grass pink and Dianthus plumarius both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass pink	Yes	No	No	No
Dianthus plumarius	Yes	No	No	No

As nouns, grass pink and Dianthus plumarius are synonyms defined as:

grass pink and Dianthus plumarius: European pink cultivated for its very fragrant pink or rosy flowers

Other synonyms of grass pink include cottage pink.

grass pink (noun)	Dianthus plumarius (noun)
an orchid	European pink cultivated for its very fragrant pink or rosy flowers
European pink cultivated for its very fragrant pink or rosy flowers