Calopogon pulchellum vs grass pink

Calopogon pulchellum and grass pink both are nouns.

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

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

Other synonyms of Calopogon pulchellum include Calopogon tuberosum.

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