| intermediacy(noun, center, middle, target) |
| axis(noun, center, middle, target) |
| centrality(noun, center, middle, target) |
| centriole(noun, center, middle, target) |
| centrum(noun, center, middle, target) |
| core(noun, center, middle, target) |
| cynosure(noun, center, middle, target) |
| essence(noun, center, middle, target) |
| focal point(noun, center, middle, target) |
| focus(noun, center, middle, target) |
| gist(noun, center, middle, target) |
| heart(noun, center, middle, target) |
| hotbed(noun, center, middle, target) |
| hub(noun, center, middle, target) |
| inside(noun, center, middle, target) |
| interior(noun, center, middle, target) |
| kernel(noun, center, middle, target) |
| mainstream(noun, center, middle, target) |
| marrow(noun, center, middle, target) |
| middle of the road(noun, center, middle, target) |