The word "stochastic" can be defined as "random" or "unpredictable," but there are several synonyms that can be used interchangeably, depending on the context. "Probabilistic" is a synonym that implies a level of uncertainty or chance. "Random" and "chaotic" are also synonyms, which can describe unpredictable events or situations. "Variable" refers to something that is subject to change and can also be considered a synonym for "stochastic." "Uncertain" can be used to describe situations where the outcome is unclear or may change suddenly. Other synonyms include "erratic," "capricious," and "unforeseeable," which describe situations where the outcome cannot be predicted with any great accuracy.