aperture, arrearage, breach, break, broaching, caesura, cavity, cessation, chasm, check, clearance, clearing, cleft, crack, defalcation, defect, deficiency, deficit, disclosure, discontinuity, distance between, double space, em space, en space, fenestra, fissure, fistula, fontanel, foramen, freeboard, gap, gape, gat, gulf, hair space, half space, hole, hollow, inlet, interim, intermediate space, intermission, interruption, interspace, interstice, interval, jump, lack, lacuna, laying open, leak, leap, leeway, letup, lull, margin, missing link, need, omission, opening, opening up, orifice, outage, outlet, passageway, pause, pore, room, shortage, single space, slot, space, space between, split, stoma, suspension, throwing open, time interval, ullage, uncorking, unstopping, want, wantage, yawn