mitrewort vs fairy cup

mitrewort and fairy cup both are nouns.

Word	Noun	Adjective	Verb	Adverb
mitrewort	Yes	No	No	No
fairy cup	Yes	No	No	No

As nouns, fairy cup is a hyponym of mitrewort; that is, fairy cup is a word with a more specific, narrower meaning than mitrewort:

mitrewort: any of various rhizomatous perennial herbs of the genus Mitella having a capsule resembling a bishop's miter
fairy cup: miterwort of northeastern North America usually with two opposite leaves on erect flowering stems that terminate in erect racemes of white flowers

Other hyponyms of mitrewort include Mitella diphylla, five-point bishop's cap, Mitella pentandra.

mitrewort (noun)	fairy cup (noun)
any of various rhizomatous perennial herbs of the genus Mitella having a capsule resembling a bishop's miter	miterwort of northeastern North America usually with two opposite leaves on erect flowering stems that terminate in erect racemes of white flowers
	a scarlet European fungus with cup-shaped ascocarp