common nardoo vs pepperwort

common nardoo and pepperwort both are nouns.

Word	Noun	Adjective	Verb	Adverb
common nardoo	Yes	No	No	No
pepperwort	Yes	No	No	No

As nouns, pepperwort is a hypernym of common nardoo; that is, pepperwort is a word with a broader meaning than common nardoo:

common nardoo: Australian clover fern
pepperwort: any of several water ferns of the genus Marsilea having four leaflets

Other hypernyms of common nardoo include clover fern.

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