1. (n.) The mouth of a river; an estuary.

2. (n.) One who keeps the door, especially the door of a church; a porter.

acolyte acolytus cerberus concierge deacon diaconus doorman exorcist exorcista gatekeeper holy orders janitor lector major orders minor orders ostiarius ostiary porter presbyter priest reader receptionist subdeacon subdiaconus usher warden