disinclination vs unwillingness

disinclination and unwillingness both are nouns.

Word	Noun	Adjective	Verb	Adverb
disinclination	Yes	No	No	No
unwillingness	Yes	No	No	No

As nouns, unwillingness is a hypernym of disinclination; that is, unwillingness is a word with a broader meaning than disinclination:

Other hypernyms of disinclination include involuntariness.

disinclination (noun)	unwillingness (noun)
a certain degree of unwillingness	the trait of being unwilling
that toward which you are inclined to feel dislike