demeanor vs trait

demeanor and trait both are nouns.

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

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

demeanor: (behavioral attributes) the way a person behaves toward other people
trait: a distinguishing feature of your personal nature

demeanor (noun)	trait (noun)
(behavioral attributes) the way a person behaves toward other people	a distinguishing feature of your personal nature