behaviour vs properness

behaviour and properness both are nouns.

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

As nouns, properness is a hyponym of behaviour; that is, properness is a word with a more specific, narrower meaning than behaviour:

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

behaviour (noun)	properness (noun)
manner of acting or controlling yourself	correct or appropriate behavior
(psychology) the aggregate of the responses or reactions or movements made by an organism in any situation
(behavioral attributes) the way a person behaves toward other people
the action or reaction of something (as a machine or substance) under specified circumstances