Venus maidenhair vs southern maidenhair

Venus maidenhair and southern maidenhair both are nouns.

Word	Noun	Adjective	Verb	Adverb
Venus maidenhair	Yes	No	No	No
southern maidenhair	Yes	No	No	No

As nouns, Venus maidenhair and southern maidenhair are synonyms defined as:

Venus maidenhair and southern maidenhair: delicate maidenhair fern with slender shining black leaf stalks; cosmopolitan

Other synonyms of Venus maidenhair include Adiantum capillus-veneris, common maidenhair, Venus'-hair fern, Venushair.

Venus maidenhair (noun)	southern maidenhair (noun)
delicate maidenhair fern with slender shining black leaf stalks; cosmopolitan	delicate maidenhair fern with slender shining black leaf stalks; cosmopolitan