Castanospermum vs Papilionoideae

Castanospermum and Papilionoideae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Castanospermum	Yes	No	No	No
Papilionoideae	Yes	No	No	No

Castanospermum (noun)	Papilionoideae (noun)
a rosid dicot genus of the subfamily Papilionoideae having one species: Moreton Bay chestnut	alternative name used in some classification systems for the family Papilionaceae