properness vs demeanour

properness and demeanour both are nouns.

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

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

properness: correct or appropriate behavior
demeanour: (behavioral attributes) the way a person behaves toward other people

Other hypernyms of properness include behavior, behaviour, conduct, demeanor, deportment.

properness (noun)	demeanour (noun)
correct or appropriate behavior	(behavioral attributes) the way a person behaves toward other people