marsh orchid vs orchid

marsh orchid and orchid both are nouns.

Word	Noun	Adjective	Verb	Adverb
marsh orchid	Yes	No	No	No
orchid	Yes	No	No	No

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

marsh orchid: any of several orchids of the genus Dactylorhiza having fingerlike tuberous roots; Europe and Mediterranean region
orchid: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors

Other hypernyms of marsh orchid include orchidaceous plant.

marsh orchid (noun)	orchid (noun)
any of several orchids of the genus Dactylorhiza having fingerlike tuberous roots; Europe and Mediterranean region	any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors