pea family vs subfamily Caesalpinioideae

pea family and subfamily Caesalpinioideae both are nouns.

Word	Noun	Adjective	Verb	Adverb
pea family	Yes	No	No	No
subfamily Caesalpinioideae	Yes	No	No	No

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