妓院 is read as ぎいん (giin) and means brothel.
ぎいん
giin
しゅうぎいん
House of Representatives (lower house of the National Diet of Japan)
さんぎいん
House of Councillors (upper house of the National Diet of Japan)
だいがくいん
graduate school
にゅういん
hospitalization
びょういん
hospital
じいん
Buddhist temple
たいいん
leaving hospital
びよういん
beauty parlour
しゅういん
そういん
monastery
さんいん
りょういん
both houses of parliament