proclivity vs disposition

proclivity and disposition both are nouns.

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

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

proclivity: a natural inclination
disposition: an attitude of mind especially one that favors one alternative over others

Other hypernyms of proclivity include inclination, tendency.

proclivity (noun)	disposition (noun)
a natural inclination	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