clover fern vs pepperwort

clover fern and pepperwort both are nouns.

Word	Noun	Adjective	Verb	Adverb
clover fern	Yes	No	No	No
pepperwort	Yes	No	No	No

As nouns, clover fern and pepperwort are synonyms defined as:

clover fern and pepperwort: any of several water ferns of the genus Marsilea having four leaflets

clover fern (noun)	pepperwort (noun)
any of several water ferns of the genus Marsilea having four leaflets	annual herb used as salad green and garnish
	any of several water ferns of the genus Marsilea having four leaflets