| headquarters(noun, place, base, edge, core) |
| navel(noun, point, average, focus, middle) |
| nitty-gritty(noun, strength, effect, subject, emotion) |
| rivet(verb, meet, direct, settle, establish) |
| root(noun, support, action, person, place) |
| nerve center(noun, expression, idiom, point, base) |
| soul(noun, force, cause, start, strength) |
| concentrate on(verb, expression, phrasal verb, involve, address) |
| driving force |
| fundamental(noun, adjective, support, action, cause) |
| intermediary(adjective, mean, middle, midway, midpoint) |
| intermediate(noun, adjective, mean, important, significant) |
| inward(middle, inside, interior, inner) |
| mall(noun, point, travelers, shoppers) |
| plaza(noun, place, point, travelers, shoppers) |
| polestar(noun, place, point, base, emotion) |
| revolve around(verb, expression, phrasal verb, involve, address) |
| seat(noun, place, cause, start, point) |
| shopping center(noun, expression, idiom, point, travelers) |
| spirit(noun, emotion, heart, soul, mood) |