Moxie

Noun

 * 1) backbone, determination and fortitude
 * 2) initiative or skill
 * 3) * John Update, Rabbit Redux:
 * As a girl she had speed and a knock-kneed moxie at athletics, and might have done more with it if she hadn't harvested all the glory already.

Thesaurus
amperage, animation, armipotence, authority, backbone, beef, birr, black power, bottom, breeziness, briskness, brute force, bubbliness, charge, charisma, clout, cogence, cogency, compulsion, courage, dauntlessness, dint, drive, duress, ebullience, effect, effectiveness, effectuality, effervescence, energy, flower power, force, force majeure, forcefulness, full blast, full force, gameness, go, grit, guts, hardihood, heart, influence, intestinal fortitude, life, liveliness, main force, main strength, mana, mettle, mettlesomeness, might, might and main, mightiness, muscle power, nerve, pep, peppiness, piss and vinegar, pith, pizzazz, pluck, pluckiness, poop, potence, potency, potentiality, power, power pack, power structure, power struggle, powerfulness, prepotency, productiveness, productivity, puissance, pull, punch, push, resolution, sand, sinew, spirit, spiritedness, sprightliness, spunk, spunkiness, stamina, steam, strength, strong arm, superiority, superpower, toughness, true grit, tuck, validity, vehemence, verve, vigor, vim, virility, virtue, virulence, vitality, vivaciousness, vivacity, wattage, weight

Anagrams

 * oxime