impartiality vs tendency

impartiality and tendency both are nouns.

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

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

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

Other hypernyms of impartiality include disposition, inclination.

impartiality (noun)	tendency (noun)
an inclination to weigh both views or opinions equally	a characteristic likelihood of or natural disposition toward a certain condition or character or effect
	an attitude of mind especially one that favors one alternative over others
	an inclination to do something
	a general direction in which something tends to move