department

1 a large unit of a governmental, business, or educational organization the Department of the Interior Synonyms agency, arm, branch, bureau, division, desk, office, serviceRelated Words subdepartment, subdivision

2 a region of activity, knowledge, or influence that's not my department, but maybe I can help you anyway Synonyms area, arena, bailiwick, barony, business, circle, demesne, field, discipline, domain, element, fief, fiefdom, firmament, front, game, kingdom, line, precinct, province, realm, specialty, sphere, terrain, walkRelated Words frontier; study, subject; territory, turf; occupation, profession, pursuit, racket, vocation; ambit, amplitude, breadth, compass, confine, dimension(s), extent, ken, reach, scope, sweep, width; subfield, subspecialty