fair-mindedness vs impartiality

fair-mindedness and impartiality both are nouns.

Word	Noun	Adjective	Verb	Adverb
fair-mindedness	Yes	No	No	No
impartiality	Yes	No	No	No

As nouns, impartiality is a hypernym of fair-mindedness; that is, impartiality is a word with a broader meaning than fair-mindedness:

fair-mindedness: ability to make judgments free from discrimination or dishonesty
impartiality: an inclination to weigh both views or opinions equally

Other hypernyms of fair-mindedness include nonpartisanship.

fair-mindedness (noun)	impartiality (noun)
ability to make judgments free from discrimination or dishonesty	an inclination to weigh both views or opinions equally