behavior vs propriety

behavior and propriety both are nouns.

Word	Noun	Adjective	Verb	Adverb
behavior	Yes	No	No	No
propriety	Yes	No	No	No

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

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

behavior (noun)	propriety (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