fen orchis vs orchid

fen orchis and orchid both are nouns.

Word	Noun	Adjective	Verb	Adverb
fen orchis	Yes	No	No	No
orchid	Yes	No	No	No

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

fen orchis: small terrestrial orchid of eastern North America and Europe having two nearly basal leaves and dull yellow-green racemose flowers
orchid: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors

Other hypernyms of fen orchis include orchidaceous plant.

fen orchis (noun)	orchid (noun)
small terrestrial orchid of eastern North America and Europe having two nearly basal leaves and dull yellow-green racemose flowers	any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors