The noun 'door' is a singular, common, concrete noun; a word for a movable barrier at the entrance of a building or a room, a thing.
The verb of entrance is "to enter".
A tall, narrow building is a tower.
The plural of entrance is entrances.
this act is called "arson" and illigal.
Foyer
The entrance to a building is a door.
There is an entrance because otherwise nobody could get in. What's the use of building a building without an entrance, except maybe as a tomb?
The entrance building to the Acropolis.
The entrance building.
It is a building at the entrance of a castle
Revolving door.
25 feet
The entrance is on the right side of the building on the bottom you have to use the crowbar to open it.
Narthex is part of the building. It is the entrance area of a church.
A rather imposing entrance to a building.
Revolving door.