| staying power(noun, expression, strength, energy, spirit) |
| strong arm(expression, force, power, strength, ability) |
| stubbornness(noun, spirit, resolve, determination, resolution) |
| stuff(noun, drive, push, energy, knowledge) |
| sturdiness(noun, strength, toughness, muscularity, burliness) |
| superiority(noun, control, right, rule, influence) |
| tirelessness(noun, determination, resolution, persistence, grit) |
| true grit(noun, expression, strength, spirit, resolve) |
| tuck(noun, action, go, drive, power) |
| undauntedness(noun, quality, fear) |
| valiancy(noun, quality, strength, determination, fear) |
| valiantness(noun, quality, fear) |
| valour |
| vigour |
| virility(noun, activity, go, style, drive) |
| vivacity(noun, go, style, drive, power) |
| wattage(noun, vigor, liveliness, vitality, get-up-and-go) |
| weight(noun, control, right, rule, influence) |
| zest(noun, go, style, drive, power) |
| élan(noun, style, power, strength, energy) |