Adiantum bellum vs maidenhair

Adiantum bellum and maidenhair both are nouns.

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

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

Adiantum bellum: delicate endemic Bermudian fern with creeping rootstock
maidenhair: any of various small to large terrestrial ferns of the genus Adiantum having delicate palmately branched fronds

Other hypernyms of Adiantum bellum include maidenhair fern.

Adiantum bellum (noun)	maidenhair (noun)
delicate endemic Bermudian fern with creeping rootstock	any of various small to large terrestrial ferns of the genus Adiantum having delicate palmately branched fronds