grass pink vs orchid

grass pink and orchid both are nouns.

Word	Noun	Adjective	Verb	Adverb
grass pink	Yes	No	No	No
orchid	Yes	No	No	No

As nouns, orchid is a hypernym of grass pink; that is, orchid is a word with a broader meaning than grass pink:

grass pink: an orchid
orchid: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors

Other hypernyms of grass pink include orchidaceous plant.

grass pink (noun)	orchid (noun)
an orchid	any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors
European pink cultivated for its very fragrant pink or rosy flowers