progressivity vs changeability

progressivity and changeability both are nouns.

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

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

progressivity: advancement toward better conditions or policies or methods
changeability: the quality of being changeable; having a marked tendency to change

Other hypernyms of progressivity include changeableness.

progressivity (noun)	changeability (noun)
advancement toward better conditions or policies or methods	the quality of being changeable; having a marked tendency to change