| ignition |
| impetus(noun, drive, push, energy, vigor) |
| indefatigability(noun, determination, resolution, endurance, persistence) |
| indomitability(noun, drive, energy, spirit, resolve) |
| kernel(noun, emotion, mood, temperament, core) |
| manliness |
| mettlesomeness |
| might(noun, drive, energy, spirit, life) |
| pepper |
| potency(noun, style, energy, spark, zest) |
| punch(noun, creativity, style, drive, strength) |
| spark(noun, style, energy, zest) |
| spine(noun, drive, strength, energy, resolve) |
| stubbornness(noun, drive, energy, spirit, resolve) |
| substance(noun, force, quality, character, strength) |
| temerity(noun, power, spirit, dash, face) |
| tenderness(noun, emotion, mood, temperament, core) |
| tirelessness(noun, determination, resolution, persistence, grit) |
| virility(noun, style, character, energy, vigor) |
| ability(noun, style, strength, resolution, capacity) |