| tension(noun, trouble, force, power, strength) |
| trouble(noun, power, strength, energy, strain) |
| velocity(noun, trouble, force, power, strength) |
| vigor(noun, trouble, force, power, strength) |
| vim(noun, force, strength, energy, vigor) |
| voltage(noun, force, strength, energy, vigor) |
| wattage(noun, strength, vigor, heat, service) |
| what it takes(noun, expression, idiom, trouble, power) |
| horseflesh |
| horsefly |
| horsehair |
| horseman |
| horsemanship |
| élan(vigor, liveliness, vitality, get-up-and-go, oomph) |
| activity(noun, vigor, liveliness, vitality, get-up-and-go) |
| agency |
| applied force(noun, expression, force, strength, energy) |
| ardor(noun, vigor, liveliness, vitality, get-up-and-go) |
| birr(noun, vigor, liveliness, vitality, get-up-and-go) |
| bite(noun, power, strength, energy, vigor) |