personal manner vs demeanor

personal manner and demeanor both are nouns.

Word	Noun	Adjective	Verb	Adverb
personal manner	Yes	No	No	No
demeanor	Yes	No	No	No

As nouns, demeanor is a hypernym of personal manner; that is, demeanor is a word with a broader meaning than personal manner:

personal manner: a way of acting or behaving
demeanor: (behavioral attributes) the way a person behaves toward other people

Other hypernyms of personal manner include behavior, behaviour, conduct, demeanour, deportment.

personal manner (noun)	demeanor (noun)
a way of acting or behaving	(behavioral attributes) the way a person behaves toward other people