deportment vs demeanour

deportment and demeanour both are nouns.

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

As nouns, deportment and demeanour are synonyms defined as:

deportment and demeanour: (behavioral attributes) the way a person behaves toward other people

Other synonyms of deportment include behavior, behaviour, conduct, demeanor.

deportment (noun)	demeanour (noun)
(behavioral attributes) the way a person behaves toward other people	(behavioral attributes) the way a person behaves toward other people