| equidistance(noun, center, middle, target) |
| focal(adjective, focus, principal) |
| fundamental(noun, support, action, cause, start) |
| inside(noun, center, middle, target) |
| intermediacy(noun, center, middle, target) |
| key(noun, answer, solution) |
| keynote(noun, support, action, substance, idea) |
| mainstream(noun, center, middle, target) |
| matter(noun, substance, idea, heart, essence) |
| middle of the road(noun, center, middle, target) |
| nuts and bolts(expression, idiom, substance, idea, essence) |
| origin(noun, body, cause, beginning, heart) |
| ovum(noun, cause, beginning, stone, source) |
| pit |
| place(noun, center, middle, target) |
| radial point(noun, center, middle, target) |
| rudiment(noun, support, action, cause, base) |
| stuff(noun, quality, cause, start, character) |
| atomic nucleus(expression, idiom) |
| burden(noun, quality, body, character, spirit) |