propensity vs inclination

propensity and inclination both are nouns.

Word	Noun	Adjective	Verb	Adverb
propensity	Yes	No	No	No
inclination	Yes	No	No	No

As nouns, inclination is a hypernym of propensity; that is, inclination is a word with a broader meaning than propensity:

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

Other hypernyms of propensity include disposition, tendency.

As nouns, inclination is a hypernym of propensity; that is, inclination is a word with a broader meaning than propensity:

propensity (noun)	inclination (noun)
a disposition to behave in a certain way	the act of inclining; bending forward
a natural inclination	a characteristic likelihood of or natural disposition toward a certain condition or character or effect
an inclination to do something	the property possessed by a line or surface that departs from the vertical
	an attitude of mind especially one that favors one alternative over others
	that toward which you are inclined to feel a liking
	(physics) the angle that a magnetic needle makes with the plane of the horizon
	(geometry) the angle formed by the x-axis and a given line (measured counterclockwise from the positive half of the x-axis)
	(astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees