A doorkeeper is a person responsible for controlling access to a building or area. JANITOR, PORTER, gateman, OSTIARY, USHER, TILER, BOUNCER, and trabant are all terms used to describe someone who performs this role. A JANITOR is someone who cleans and maintains a building, while a PORTER is someone who carries luggage or other items. A gateman is someone who guards an entrance or gate, and an OSTIARY is a doorkeeper in a religious institution. An USHER is someone who shows people to their seats in a theater or other venue, and a TILER is someone who lays tiles. A BOUNCER is someone who ejects unruly patrons from a bar or nightclub, and a trabant is a guard who patrols the grounds of a castle or other large estate.