grass pink vs Calopogon pulchellum

grass pink and Calopogon pulchellum both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass pink	Yes	No	No	No
Calopogon pulchellum	Yes	No	No	No

As nouns, grass pink and Calopogon pulchellum are synonyms defined as:

Other synonyms of grass pink include Calopogon tuberosum.

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