Fabaceae vs subfamily Papilionoideae

Fabaceae and subfamily Papilionoideae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fabaceae	Yes	No	No	No
subfamily Papilionoideae	Yes	No	No	No

Fabaceae (noun)	subfamily Papilionoideae (noun)
a large family of trees, shrubs, vines, and herbs bearing bean pods; divided for convenience into the subfamilies Caesalpiniaceae, Mimosaceae, Papilionaceae	alternative name used in some classification systems for the family Papilionaceae