genus Equisetum vs fern genus

genus Equisetum and fern genus both are nouns.

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

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

genus Equisetum (noun)	fern genus (noun)
horsetails; coextensive with the family Equisetaceae	genera of ferns and fern allies