demeanour vs trait

demeanour and trait both are nouns.

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

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

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

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