boundary Antonyms

midriff penetralia plaza polestar quintessence radicalism region rhizome seat target territorial ticker topography trunnion umbilicus peeper optic midship midst minimum nadir nation nave navel nidus nonmember nub nucleolus nucleus oculus omphalos viscera vitals waist midfield midstream center of gravity HQ Central Point centre of attention epicenter epicentre forefront ground zero hot spot rallying point showpiece central core mesolithic mecca