Synonyms and related words :
access, admission, admittance, air lock, approach, channel, conduit, corridor, course, ditch, duct, egress, entrance, entranceway, entree, entry, entryway, exit, gangplank, gangway, hall, in, ingress, inlet, intake, means of access, opening, passage, passageway, trench, trough, troughing, troughway, tunnel, vestibule, way, way in