admittance — Admittance is the act of entering a place or institution or the right to enter it.
admission — Admission is permission given to a person to enter a place, or permission given to a country to enter an organization. Admission is also the act of entering a place.
access — If you have access to a building or other place, you are able or allowed to go into it.
adit — an almost horizontal shaft into a mine, for access or drainage
connection — A connection is a relationship between two things, people, or groups.
contact — Contact involves meeting or communicating with someone, especially regularly.
debut — The debut of a performer or sports player is their first public performance, appearance, or recording.
door — a movable, usually solid, barrier for opening and closing an entranceway, cupboard, cabinet, or the like, commonly turning on hinges or sliding in grooves.
entrance — An opening, such as a door, passage, or gate, that allows access to a place.