partiality vs disposition

partiality and disposition both are nouns.

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

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

partiality: an inclination to favor one group or view or opinion over alternatives
disposition: an attitude of mind especially one that favors one alternative over others

Other hypernyms of partiality include inclination, tendency.

partiality (noun)	disposition (noun)
an inclination to favor one group or view or opinion over alternatives	the act or means of getting rid of something
a predisposition to like 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