common nardoo vs clover fern

common nardoo and clover fern both are nouns.

Word	Noun	Adjective	Verb	Adverb
common nardoo	Yes	No	No	No
clover fern	Yes	No	No	No

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

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

Other hypernyms of common nardoo include pepperwort.

common nardoo (noun)	clover fern (noun)
Australian clover fern	any of several water ferns of the genus Marsilea having four leaflets