attitude vs mannerism

attitude and mannerism both are nouns.

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

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

Other hypernyms of attitude include affectation, affectedness, pose.

attitude (noun)	mannerism (noun)
a theatrical pose created for effect	a deliberate pretense or exaggerated display
the arrangement of the body and its limbs	a behavioral attribute that is distinctive and peculiar to an individual
a complex mental state involving beliefs and feelings and values and dispositions to act in certain ways
position of aircraft or spacecraft relative to a frame of reference (the horizon or direction of motion)