世界【せかい】
the world, society, the universe, sphere, circle, world, world-renowned, world-famous, realm governed by one Buddha, space
政界【せいかい】
(world of) politics, political world, political circles
財界【ざいかい】
financial world, business circles
限界【げんかい】
limit, bound
境界【きょうかい】
boundary, border, limit, bounds, frontier
視界【しかい】
field of vision, visibility, view, visual field, (one's) ken
学界【がっかい】
academic world, academia, academic circles, scientific world, learned circles
外界【がいかい】
outside world, physical world
法曹界【ほうそうかい】
legal circles
下界【げかい】
the world, the earth, this world (as opposed to heaven)
花柳界【かりゅうかい】
red-light district, pleasure quarters, world of the geisha, demimonde
租界【そかい】
concession, settlement