Synonyms and related words :
abettor, actuator, animator, cajoler, coax, coaxer, encourager, energizer, firer, gad, galvanizer, goad, impeller, inducer, inspirer, lash, mover, moving spirit, oxgoad, persuader, pleader, prick, prime mover, prod, prompter, rowel, spark, spark plug, sparker, spur, stimulator, sting, tempter, wheedler, whip, whiplash