| gritstone |
| gut |
| guttiness(noun, resolve, determination, firmness, persistence) |
| intrepidness(noun, spirit, dash, courage) |
| life force(noun, expression, force, quality, character) |
| lifeblood(noun, nature, quality, character, spirit) |
| lion-heartedness(spirit, dash, courage, nerve, guts) |
| lustiness(noun, health, force, body, power) |
| maintainer(support, stay, rock, partisan, pillar) |
| maturity(noun, support, control, strength, balance) |
| morale(noun, force, quality, character, strength) |
| motivation(noun, force, quality, drive, character) |
| muscle(noun, health, force, body, power) |
| postulate(noun, support, action, base, beginning) |
| power(noun, health, force, body, drive) |
| powerhouse(noun, health, force, body, power) |
| prop(noun, support, stay, partisan, pillar) |
| prowess(noun, spirit, dash, informal, courage) |
| psyche(noun, force, quality, character, strength) |
| quiddity(noun, nature, quality, character, spirit) |