center

headquarters

happy hunting ground, hive, hotbed, hot spot, playground, playland

kernel, nub, pith

deep, thick

essence, quintessence, soul

attraction, lodestone (also loadstone), magnet, polestar

inside, interior

coordinate, harmonize, integrate, orchestrate

blend, coalesce, combine, fuse, incorporate, merge, reduce

conjoin, join, link

assemble, collect, colligate, gather

reunify, reunite

aim, direct, home (in on), hone in (on), level, nail, point, set, zero (in on)

attend, heed, mind

fixate (on), obsess (over)

refocus