five-fingered maidenhair fern vs American maidenhair fern

five-fingered maidenhair fern and American maidenhair fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
five-fingered maidenhair fern	Yes	No	No	No
American maidenhair fern	Yes	No	No	No

As nouns, five-fingered maidenhair fern and American maidenhair fern are synonyms defined as:

five-fingered maidenhair fern and American maidenhair fern: hardy palmately branched North American fern with divergent recurved branches borne on lustrous dark reddish stipes

Other synonyms of five-fingered maidenhair fern include Adiantum pedatum.

five-fingered maidenhair fern (noun)	American maidenhair fern (noun)
hardy palmately branched North American fern with divergent recurved branches borne on lustrous dark reddish stipes	hardy palmately branched North American fern with divergent recurved branches borne on lustrous dark reddish stipes