commutability vs changeability

commutability and changeability both are nouns.

Word	Noun	Adjective	Verb	Adverb
commutability	Yes	No	No	No
changeability	Yes	No	No	No

As nouns, changeability is a hypernym of commutability; that is, changeability is a word with a broader meaning than commutability:

commutability: the quality of being commutable
changeability: the quality of being changeable; having a marked tendency to change

Other hypernyms of commutability include changeableness.

commutability (noun)	changeability (noun)
the quality of being commutable	the quality of being changeable; having a marked tendency to change
exchangeability by virtue of being replaceable