(n.) One whose occupation is to tend cows.

breaker breeder broncobuster buckaroo cow keeper cowboy cowgirl cowhand cowherd cowman cowpuncher dairy farmer dairyman drover equerry farrier gaucho goatherd gooseboy gooseherd grazier groom herder herdsman hogherd horse wrangler horseherd horseshoer hostler pigman puncher rancher ranchero ranchman sheepherder sheepman shepherd shepherdess stableboy stableman stock raiser stockbreeder stockkeeper stockman swanherd swineherd tamer trainer vaquero waddy wrangler