Same word as zeal:

alacrity, ardor, bustle, determination, devotion, diligence, dispatch, drive, eagerness, earnestness, enterprise, fanaticism, fervor, fierceness, fire, gusto, hustle, inclination, initiative, intensity, intentness, keenness, mania, passion, perseverance, push, readiness, sincerity, spirit, stick-to-itiveness, urgency, vehemence, verve, warmth, what-it-takes, yen, zest