class Filicinae vs family Athyriaceae

class Filicinae and family Athyriaceae both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Filicinae	Yes	No	No	No
family Athyriaceae	Yes	No	No	No

class Filicinae (noun)	family Athyriaceae (noun)
ferns	alternative names for one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems