tongue fern vs Pyrrosia lingua

tongue fern and Pyrrosia lingua both are nouns.

Word	Noun	Adjective	Verb	Adverb
tongue fern	Yes	No	No	No
Pyrrosia lingua	Yes	No	No	No

As nouns, tongue fern and Pyrrosia lingua are synonyms defined as:

tongue fern and Pyrrosia lingua: east Asian fern having fronds shaped like tongues; sometimes placed in genus Cyclophorus

Other synonyms of tongue fern include Cyclophorus lingua, felt fern.

tongue fern (noun)	Pyrrosia lingua (noun)
east Asian fern having fronds shaped like tongues; sometimes placed in genus Cyclophorus	east Asian fern having fronds shaped like tongues; sometimes placed in genus Cyclophorus