monoplane

acid rain, aeroplane, appertain, aquaplane, Aquitaine, ascertain, Bloemfontein, bullet train, cell membrane, cellophane, Charlemagne, Charles's Wain, chatelain, chatelaine, counterpane, daisy-chain, down the drain, entertain, featherbrain, focal plane, foreordain, frangipane, free throw lane, gravy train, gyroplane, high-octane, hurricane, hydroplane, hyperplane, inclined plane, inhumane, Kwajalein, London plane, marocain, Mary Jane, memory lane, mise-en-scène, Novocain, novocaine, paravane, paper-train, peneplain, pollen grain, Port of Spain, power train, preordain, pursuit plane, rattlebrain, rhizoplane, rocket plane, scatterbrain, shaggymane, Spanish Main, sugarcane, suzerain, take in vain, Tamerlane, tangent plane, terreplein, toilet train, tramontane, transmontane, unit train, urethane, wagon train, water main, weather vane, whooping crane, windowpane, yellow rain