Adiantum pedatum vs maidenhair

Adiantum pedatum and maidenhair both are nouns.

Word	Noun	Adjective	Verb	Adverb
Adiantum pedatum	Yes	No	No	No
maidenhair	Yes	No	No	No

As nouns, maidenhair is a hypernym of Adiantum pedatum; that is, maidenhair is a word with a broader meaning than Adiantum pedatum:

Adiantum pedatum: hardy palmately branched North American fern with divergent recurved branches borne on lustrous dark reddish stipes
maidenhair: any of various small to large terrestrial ferns of the genus Adiantum having delicate palmately branched fronds

Other hypernyms of Adiantum pedatum include maidenhair fern.

Adiantum pedatum (noun)	maidenhair (noun)
hardy palmately branched North American fern with divergent recurved branches borne on lustrous dark reddish stipes	any of various small to large terrestrial ferns of the genus Adiantum having delicate palmately branched fronds