folly vs trait

folly and trait both are nouns.

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

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

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