Synonyms: port, porthole, embrasure
Definition: an opening (in a wall or ship or armored vehicle) for firing through
Similar words: opening
Definition: a vacant or unobstructed space that is man-made
Usage: they left a small opening for the cat at the bottom of the door
Synonyms: porthole
Definition: a window in a ship or airplane
Similar words: window
Definition: a framework of wood or metal that contains a glass windowpane and is built into a wall or roof to admit light or air