ergodicity vs stochasticity

ergodicity and stochasticity both are nouns.

Word	Noun	Adjective	Verb	Adverb
ergodicity	Yes	No	No	No
stochasticity	Yes	No	No	No

As nouns, stochasticity is a hypernym of ergodicity; that is, stochasticity is a word with a broader meaning than ergodicity:

ergodicity: an attribute of stochastic systems; generally, a system that tends in probability to a limiting form that is independent of the initial conditions
stochasticity: the quality of lacking any predictable order or plan

Other hypernyms of ergodicity include haphazardness, noise, randomness.

ergodicity (noun)	stochasticity (noun)
an attribute of stochastic systems; generally, a system that tends in probability to a limiting form that is independent of the initial conditions	the quality of lacking any predictable order or plan