Pteris vs fern genus

Pteris and fern genus both are nouns.

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

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

Pteris: large genus of terrestrial ferns of tropics and subtropics; sometimes placed in family Polypodiaceae
fern genus: genera of ferns and fern allies

Pteris (noun)	fern genus (noun)
large genus of terrestrial ferns of tropics and subtropics; sometimes placed in family Polypodiaceae	genera of ferns and fern allies