Vittariaceae vs fern family

Vittariaceae and fern family both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vittariaceae	Yes	No	No	No
fern family	Yes	No	No	No

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

Vittariaceae: one of a number of families into which Polypodiaceae has been subdivided in some classification systems: genus Vittaria
fern family: families of ferns and fern allies

Vittariaceae (noun)	fern family (noun)
one of a number of families into which Polypodiaceae has been subdivided in some classification systems: genus Vittaria	families of ferns and fern allies