| headquarters(noun, base, capital, core, axis) |
| hive(noun, base, capital, core, axis) |
| hotbed(noun, base, capital, core, axis) |
| hub(noun, base, capital, core, axis) |
| hypothesis(noun, essence, core, gist, centerpiece) |
| keynote(noun, essence, core, gist, centerpiece) |
| kickback(noun, take, answer, response, reply) |
| loadstone(noun, base, capital, core, axis) |
| locus(noun, base, capital, core, axis) |
| lodestone(noun, base, capital, core, axis) |
| magnet(noun, base, capital, core, axis) |
| meat(noun, essence, core, gist, centerpiece) |
| mecca(noun, base, capital, core, axis) |
| navel(noun, base, capital, core, axis) |
| net(noun, essence, core, gist, centerpiece) |
| nexus(noun, base, capital, core, axis) |
| nubbin(noun, essence, core, gist, centerpiece) |
| nucleus(noun, base, capital, core, axis) |
| omphalos(noun, base, capital, core, axis) |
| pivot(noun, essence, core, gist, centerpiece) |