| crux(noun, quality, cause, start, character) |
| axis(noun, center, middle, target) |
| being(noun, quality, character, spirit, significance) |
| principle(noun, quality, feeling, character, energy) |
| backbone(noun, quality, character, spirit, significance) |
| bottom(noun, quality, feeling, cause, start) |
| inwardness |
| midpoint(noun, center, middle, target) |
| pivot(noun, center, middle, target) |
| pulp(noun, animal, force, heart, essence) |
| quiddity(noun, quality, character, spirit, significance) |
| centre |
| essentiality(noun, quality, cause, start, character) |
| gravamen(noun, law, effect, heart, essence) |
| medulla(noun, force, heart, essence, center) |
| nave(noun, center, middle, target, centrality) |
| navel(noun, center, middle, target, centrality) |
| quick(noun, place, cause, start, spirit) |
| spunk(noun, emotion, mood, temperament, core) |
| bone marrow(noun, expression, idiom) |