motorcar(n = noun.artifact) auto, automobile, car, machine - a motor vehicle with four wheels; usually propelled by an internal combustion engine; "he needs a car to get to work"
is a kind of automotive vehicle, motor vehicle
has parts: accelerator, accelerator pedal, gas, gas pedal, gun, throttle, air bag, auto accessory, automobile engine, automobile horn, car horn, hooter, horn, motor horn, buffer, fender, bumper, car door, car mirror, car seat, car window, fender, wing, first, first gear, low, low gear, floorboard, gasoline engine, petrol engine, glove compartment, grille, radiator grille, high, high gear, bonnet, cowl, cowling, hood, automobile trunk, luggage compartment, trunk, rear window, reverse, reverse gear, roof, running board, anti-sway bar, stabilizer bar, sunroof, sunshine-roof, fin, tail fin, tailfin, third, third gear, window
has particulars: ambulance, beach waggon, beach wagon, estate car, station waggon, station wagon, waggon, wagon, bus, heap, jalopy, cab, hack, taxi, taxicab, compact, compact car, convertible, coupe, cruiser, patrol car, police car, police cruiser, prowl car, squad car, electric, electric automobile, electric car, gas guzzler, hardtop, hatchback, horseless carriage, hot-rod, hot rod, jeep, landrover, limo, limousine, loaner, minicar, minivan, model t, pace car, race car, racer, racing car, roadster, runabout, two-seater, saloon, sedan, sport car, sports car, s.u.v., sport utility, sport utility vehicle, suv, stanley steamer, stock car, subcompact, subcompact car, phaeton, tourer, touring car, secondhand car, used-car

1.  An automobile, locomobile, or locomotive designed to run and be steered on a street or roadway; esp., an automobile specially designed for passengers and propelled by an internal combustion engine. [Webster 1913 Suppl.]

2.  Any car containing motors for propulsion. [Webster 1913 Suppl.]