brittle maidenhair vs brittle maidenhair fern

brittle maidenhair and brittle maidenhair fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
brittle maidenhair	Yes	No	No	No
brittle maidenhair fern	Yes	No	No	No

As nouns, brittle maidenhair and brittle maidenhair fern are synonyms defined as:

brittle maidenhair and brittle maidenhair fern: tropical American fern with broad pinnae; widely cultivated

Other synonyms of brittle maidenhair include Adiantum tenerum.

brittle maidenhair (noun)	brittle maidenhair fern (noun)
tropical American fern with broad pinnae; widely cultivated	tropical American fern with broad pinnae; widely cultivated