| inside(noun, place, quick, heart, core) |
| axis(noun, center, middle, target) |
| betwixt |
| betwixt and between(noun, expression, idiom, core, center) |
| bosom(noun, heart, core, center, middle) |
| deep(noun, heart, core, center, middle) |
| marrow(noun, center, middle, target) |
| midriff(noun, heart, midpoint, mortar, meridian) |
| pivot(noun, center, middle, target) |
| centrality(noun, center, middle, target) |
| centriole(noun, center, middle, target) |
| centrum(noun, center, middle, target) |
| cynosure(noun, center, middle, target) |
| depth |
| diaphragm |
| equidistance(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) |