demeanor

As nouns the difference between demeanor and action

is that demeanor is the social, non-verbal behaviours (such as body language and facial expressions) that are characteristic of a person while action is something done so as to accomplish a purpose.

As an interjection action is

demanding or signifying the start of something, usually an act or scene of a theatric performance.

As a verb action is

to act on a request etc, in order to put it into effect.

As nouns the difference between demeanor and amenance

is that demeanor is the social, non-verbal behaviours (such as body language and facial expressions) that are characteristic of a person while amenance is conduct, demeanor.