Synonyms and related words :
aggressiveness, bang, bite, briskness, dash, drive, enterprise, fire, get-up-and-go, guts, hotness, initiative, kick, liveliness, nip, nippiness, pep, pepper, pepperiness, piss and vinegar, pizzazz, poop, punch, push, raciness, relish, snap, snappiness, spice, spiciness, spunk, starch, tang, tanginess, thrust, verve, vim, zest, zestfulness, zing, zip