foolishness vs trait

foolishness and trait both are nouns.

Word	Noun	Adjective	Verb	Adverb
foolishness	Yes	No	No	No
trait	Yes	No	No	No

As nouns, trait is a hypernym of foolishness; that is, trait is a word with a broader meaning than foolishness:

foolishness (noun)	trait (noun)
a stupid mistake	a distinguishing feature of your personal nature
the trait of acting stupidly or rashly
the quality of being rash and foolish