mannerism vs distinctiveness

mannerism and distinctiveness both are nouns.

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

As nouns, distinctiveness is a hypernym of mannerism; that is, distinctiveness is a word with a broader meaning than mannerism:

mannerism: a behavioral attribute that is distinctive and peculiar to an individual
distinctiveness: a distinguishing trait

Other hypernyms of mannerism include peculiarity, speciality, specialness, specialty.

mannerism (noun)	distinctiveness (noun)
a deliberate pretense or exaggerated display	utter dissimilarity
a behavioral attribute that is distinctive and peculiar to an individual	a distinguishing trait