manners vs behaviour

manners and behaviour both are nouns.

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

As nouns, behaviour is a hypernym of manners; that is, behaviour is a word with a broader meaning than manners:

manners: social deportment
behaviour: (behavioral attributes) the way a person behaves toward other people

Other hypernyms of manners include behavior, conduct, demeanor, demeanour, deportment.

manners (noun)	behaviour (noun)
social deportment	manner of acting or controlling yourself
	(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