WordNet sense 1 (a particular environment or walk of life):

area, arena, domain, field, sphere

WordNet sense 2 (the path of an electron around the nucleus of an atom):

electron orbit

WordNet sense 3 (the (usually elliptical) path described by one celestial body in its revolution about another):

celestial orbit

WordNet sense 4 (the bony cavity in the skull containing the eyeball):

eye socket, cranial orbit, orbital cavity

WordNet sense 5 (an area in which something acts or operates or has power or control:):

compass, range, reach, scope, ambit

WordNet sense 6 (move in an orbit):

orb, revolve