doorknob
A handle used to open or close a door.
He turned the brass doorknob and entered the room.
doorbell
A bell or button at a door that signals someone's arrival.
I rang the doorbell but nobody answered.
doorway
The opening or entrance framed by a door.
A tall woman filled the doorway.
doorman
A person employed to attend the entrance of a building or hotel.
The hotel doorman hailed a taxi for us.
doorstep
The step or area directly in front of a door.
She left the package on the doorstep.
doorkeeper
A person who guards or controls access to a door or entrance.
The doorkeeper checked their invitations before they entered.
doorknocker
A metal device fixed to a door used for knocking.
He hammered the doorknocker until someone opened.
trapdoor
A hinged or removable panel in a floor or ceiling giving access to a space below or above.
The floor had a hidden trapdoor leading to the cellar.
backdoor
A secondary or rear door; also used figuratively for an indirect method.
They entered through the backdoor to avoid the crowd.
outdoor
Relating to or taking place outside a building.
We enjoyed an outdoor concert all evening.