clover fern vs nardo

clover fern and nardo both are nouns.

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

As nouns, nardo is a hyponym of clover fern; that is, nardo is a word with a more specific, narrower meaning than clover fern:

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

Other hyponyms of clover fern include common nardoo, Marsilea drummondii, nardoo, Marsilea quadrifolia, water clover.

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