impartiality vs disposition

impartiality and disposition both are nouns.

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

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

impartiality: an inclination to weigh both views or opinions equally
disposition: an attitude of mind especially one that favors one alternative over others

Other hypernyms of impartiality include inclination, tendency.

impartiality (noun)	disposition (noun)
an inclination to weigh both views or opinions equally	the act or means of getting rid of something
	your usual mood
	a natural or acquired habit or characteristic tendency in a person or thing
	an attitude of mind especially one that favors one alternative over others