good nature vs disposition

good nature and disposition both are nouns.

Word	Noun	Adjective	Verb	Adverb
good nature	Yes	No	No	No
disposition	Yes	No	No	No

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

Other hypernyms of good nature include temperament.

good nature (noun)	disposition (noun)
a cheerful, obliging disposition	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