affectedness vs mannerism

affectedness and mannerism both are nouns.

Word	Noun	Adjective	Verb	Adverb
affectedness	Yes	No	No	No
mannerism	Yes	No	No	No

As nouns, affectedness and mannerism are synonyms defined as:

affectedness and mannerism: a deliberate pretense or exaggerated display

Other synonyms of affectedness include affectation, pose.

affectedness (noun)	mannerism (noun)
a deliberate pretense or exaggerated display	a deliberate pretense or exaggerated display
the quality of being false or artificial (as to impress others)	a behavioral attribute that is distinctive and peculiar to an individual