mental capacity vs mentality

mental capacity and mentality both are nouns.

Word	Noun	Adjective	Verb	Adverb
mental capacity	Yes	No	No	No
mentality	Yes	No	No	No

As nouns, mental capacity and mentality are synonyms defined as:

Other synonyms of mental capacity include brain, brainpower, learning ability, wit.

mental capacity (noun)	mentality (noun)
mental ability	mental ability
	a habitual or characteristic mental attitude that determines how you will interpret and respond to situations