"Impetuses" is a plural noun form of the word "impetus". It refers to a driving force that motivates or encourages an action or change. There are different synonyms that can be used instead of "impetuses", depending on context and tone. For instance, "stimulus" conveys the idea of provoking a reaction or bringing about a change. "Incentive" emphasizes a tangible or intangible reward that encourages a particular behavior. "Momentum" highlights the idea of a continuous flow or development. Other synonyms for "impetuses" include "catalyst", "propellant", "stimulant", or "pioneer", depending on the specific situation. All these words share the concept of a driving force or factor that initiates or accelerates activity or progress.