| gravamen(noun, law, effect, heart, essence) |
| lump(noun, handle, bump, knot, protuberance) |
| middle(noun, body, substance, emotion, heart) |
| nubble |
| bottom(noun, adjective, quality, cause, start) |
| centre |
| inwardness |
| quiddity(noun, quality, character, spirit, significance) |
| soul(noun, quality, cause, start, character) |
| swelling(noun, handle, head, bump, lump) |
| hub(noun, emotion, heart, soul, mood) |
| knot(noun, handle, bump, lump, protuberance) |
| nubbin(noun, essence, core, fundamental, nut) |
| root(noun, adjective, quality, body, cause) |
| spirit(noun, quality, character, substance, idea) |
| stuff(noun, good, quality, understanding, cause) |
| sum(noun, inside, filling, innards) |
| sum and substance(expression, idiom, heart, essence, nucleus) |
| basis(noun, quality, body, cause, start) |
| burden(noun, good, quality, understanding, body) |