Synonyms and related words :
air speed, alacrity, bat, briskness, dispatch, expedition, expeditiousness, fastness, flight, flit, flurry, gait, ground speed, haste, hurry, hustle, instantaneousness, knots, legerity, lightning speed, miles per hour, pace, precipitation, promptitude, promptness, quickness, rapidity, round pace, rpm, rush, rustle, snappiness, speed, speediness, swift rate, swiftness, velocity