Access, Adit, Aisle, Alley, Ambulatory, Aperture, Arcade, Artery, Avenue, Bore, Bunker, Burrow, Cave, Cavern, Channel, Cloister, Colonnade, Communication, Conduit, Connection, Corridor, Couch, Course, Cove, Covert, Deepen, Defile, Delve, Den, Depress, Dig, Ditch, Dive, Dredge, Drill, Drive, Duct, Dugout, Earth, Egress, Entrance, Entrenchment, Excavate, Exit, Ferry, Ford, Form, Foxhole, Furrow, Gallery, Gouge, Groove, Grotto, Grub, Hole, Ingress, Inlet, Interchange, Intersection, Junction, Lair, Lane, Lodge, Lower, Mew, Mine, Moat, Opening, Outlet, Overpass, Parallel, Pass, Passage, Passageway, Penetrate, Portico, Quarry, Run, Sap, Scoop, Scrabble, Scrape, Scratch, Sewer, Shaft, Shovel, Sink, Spade, Subway, Trench, Trough, Underpass, Warren, Way