rustler(n = noun.person) cattle thief - someone who steals livestock (especially cattle);
is a kind of stealer, thief
Derived form verb rustle2
1. One who, or that which, rustles. [1913 Webster]
2. A bovine animal that can care for itself in any circumstances; also, an alert, energetic, driving person. [1913 Webster]
N activity, briskness, liveliness, animation, life, vivacity, spirit, dash, energy, snap, vim, nimbleness, agility, smartness, quickness, velocity, alacrity, promptitude, despatch, dispatch, expedition, haste, punctuality, eagerness, zeal, ardor, perfervidum aingenium, empressement, earnestness, intentness, abandon, vigor, devotion, exertion, industry, assiduity, assiduousness, sedulity, laboriousness, drudgery, painstaking, diligence, perseverance, indefatigation, habits of business, vigilance, wakefulness, sleeplessness, restlessness, insomnia, pervigilium, insomnium, racketing, movement, bustle, stir, fuss, ado, bother, pottering, fidget, fidgetiness, flurry, officiousness, dabbling, meddling, interference, interposition, intermeddling, tampering with, intrigue, press of business, no sinecure, plenty to do, many irons in the fire, great doings, busy hum of men, battle of life, thick of the action, housewife, busy bee, new brooms, sharp fellow, sharp blade, devotee, enthusiast, zealot, meddler, intermeddler, intriguer, busybody, pickthank, hummer, hustler, live man, rustler, active, brisk, brisk as a lark, brisk as a bee, lively, animated, vivacious, alive, alive and kicking, frisky, spirited, stirring, nimble, nimble as a squirrel, agile, light-footed, nimble-footed, featly, tripping, quick, prompt, yare, instant, ready, alert, spry, sharp, smart, fast, quick as a lamplighter, expeditious, awake, broad awake, go-ahead, live wide-awake, forward, eager, strenuous, zealous, enterprising, in earnest, resolute, industrious, assiduous, diligent, sedulous, notable, painstaking, intent, indefatigable, unwearied, unsleeping, never tired, plodding, hard-working, businesslike, workaday, bustling, restless, restless as a hyena, fussy, fidgety, pottering, busy, busy as hen with one chicken, working, at work, on duty, in harness, up in arms, on one's legs, at call, up and doing, up and stirring, busy, occupied, hard at work, hard at it, up to one's ears in, full of business, busy as a bee, busy as a one-armed paperhanger, meddling, meddlesome, pushing, officious, overofficious, intrigant, astir, stirring, agoing, afoot, on foot, in full swing, eventful, on the alert, actively, with life and spirit, with might and main &c, with haste, with wings, full tilt, in mediis rebus, Int, be alive, look alive, look sharp!, move on, push on!, keep moving!, go ahead!, stir your stumps!, age quod agis!, jaldi!, karo!, step lively!, carpe diem, seize the day, nulla dies sine linea, nec mora nec requies, the plot thickens, No sooner said than done, veni vidi vici, catch a weasel asleep, abends wird der Faule fleissig, dictum ac factum, schwere Arbeit in der Jugend ist sanfte Ruhe im Al, hard work in youth means soft rest in age, the busy hum of men.
N thief, robber, homo triumliterarum, pilferer, rifler, filcher, plagiarist, spoiler, depredator, pillager, marauder, harpy, shark, land shark, falcon, mosstrooper, bushranger, Bedouin, brigand, freebooter, bandit, thug, dacoit, pirate, corsair, viking, Paul Jones, buccaneer, buccanier, piqueerer, pickeerer, rover, ranger, privateer, filibuster, rapparee, wrecker, picaroon, smuggler, poacher, abductor, badger, bunko man, cattle thief, chor, contrabandist, crook, hawk, holdup man, hold-up, jackleg, kidnaper, rustler, cattle rustler, sandbagger, sea king, skin, sneak thief, spieler, strong-arm man, highwayman, Dick Turpin, Claude Duval, Macheath, footpad, sturdy beggar, cut purse, pick purse, pickpocket, light-fingered gentry, sharper, card sharper, skittle sharper, thimblerigger, rook, Greek, blackleg, leg, welsher, defaulter, Autolycus, Jeremy Diddler, Robert Macaire, artful dodger, trickster, swell mob, chevalier d'industrie, shoplifter, swindler, peculator, forger, coiner, fence, receiver of stolen goods, duffer, smasher, burglar, housebreaker, cracksman, magsman, Bill Sikes, Jack Sheppard, Jonathan Wild, gang, gang of thieves, theft ring, organized crime, mafia, the Sicilian Mafia, the mob, la cosa nostra, Dillinger, Al Capone, Robin Hood.