impropriety vs demeanor

impropriety and demeanor both are nouns.

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

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

impropriety: an improper demeanor
demeanor: (behavioral attributes) the way a person behaves toward other people

Other hypernyms of impropriety include behavior, behaviour, conduct, demeanour, deportment.

impropriety (noun)	demeanor (noun)
an act of undue intimacy	(behavioral attributes) the way a person behaves toward other people
an indecent or improper act
an improper demeanor
the condition of being improper