impartiality vs candour

impartiality and candour both are nouns.

Word	Noun	Adjective	Verb	Adverb
impartiality	Yes	No	No	No
candour	Yes	No	No	No

As nouns, candour is a hyponym of impartiality; that is, candour is a word with a more specific, narrower meaning than impartiality:

Other hyponyms of impartiality include disinterestedness, candor, fair-mindedness, fairness.

impartiality (noun)	candour (noun)
an inclination to weigh both views or opinions equally	the quality of being honest and straightforward in attitude and speech
	ability to make judgments free from discrimination or dishonesty