genus Matteuccia vs fern genus

genus Matteuccia and fern genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Matteuccia	Yes	No	No	No
fern genus	Yes	No	No	No

As nouns, fern genus is a hypernym of genus Matteuccia; that is, fern genus is a word with a broader meaning than genus Matteuccia:

genus Matteuccia: small genus sometimes included in genus Onoclea; in some classifications both genera are placed in Polypodiaceae
fern genus: genera of ferns and fern allies

genus Matteuccia (noun)	fern genus (noun)
small genus sometimes included in genus Onoclea; in some classifications both genera are placed in Polypodiaceae	genera of ferns and fern allies