mindset vs mental attitude

mindset and mental attitude both are nouns.

Word	Noun	Adjective	Verb	Adverb
mindset	Yes	No	No	No
mental attitude	Yes	No	No	No

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

mindset: a habitual or characteristic mental attitude that determines how you will interpret and respond to situations
mental attitude: a complex mental state involving beliefs and feelings and values and dispositions to act in certain ways

Other hypernyms of mindset include attitude.

mindset (noun)	mental attitude (noun)
a habitual or characteristic mental attitude that determines how you will interpret and respond to situations	a complex mental state involving beliefs and feelings and values and dispositions to act in certain ways