mind-set vs mental attitude

mind-set and mental attitude both are nouns.

Word	Noun	Adjective	Verb	Adverb
mind-set	Yes	No	No	No
mental attitude	Yes	No	No	No

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

mind-set: 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 mind-set include attitude.

mind-set (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