flexibility vs trait

flexibility and trait both are nouns.

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

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

flexibility (noun)	trait (noun)
the quality of being adaptable or variable	a distinguishing feature of your personal nature
the property of being flexible; easily bent or shaped
the trait of being easily persuaded