Impellents are tools or devices which are used to propel or move a particular object. There are various synonyms for the word "impellents." These includes catalyst, incentive, goad, spur, stimulant, force, power, push factor, driving force, and incitement. Catalyst is something that triggers a reaction or change, while incentive is something that motivates or encourages action. A goad is used to aid movement in a particular direction. Meanwhile, stimulant is something that activates and energizes, while force and power refer to strength and energy applied to move an object. Push factor and driving force refer to the cause of an action or movement, while incitement is something that inspires or provokes an action.