improperness vs deportment

improperness and deportment both are nouns.

Word	Noun	Adjective	Verb	Adverb
improperness	Yes	No	No	No
deportment	Yes	No	No	No

As nouns, deportment is a hypernym of improperness; that is, deportment is a word with a broader meaning than improperness:

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

Other hypernyms of improperness include behavior, behaviour, conduct, demeanor, demeanour.

improperness (noun)	deportment (noun)
an improper demeanor	(behavioral attributes) the way a person behaves toward other people