WordNet sense 1 (sweet dark-red dessert wine originally from Portugal):

port wine

WordNet sense 2 (the left side of a ship or aircraft to someone facing the bow or nose):

larboard

WordNet sense 3 (an opening (in a wall or ship or armored vehicle) for firing through):

embrasure, porthole

WordNet sense 4 ((computer science) computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals)):

interface

WordNet sense 5 (being or located on or directed toward the side of the body to the west when facing north):

left