#herder__herdsman__drover  someone who drives a herd
  supertype:  hired_hand__hiredhand__hand__hired_man__hiredman  a hired laborer on a farm or ranch; "the hired hand fixed the railing"; "a ranch hand"
  subtype:  goatherder__goatherd  a person who tends a flock of goats
  subtype:  sheepherder__shepherd__sheepman  a herder of sheep (on an open range); someone who keeps the sheep together in a flock
     subtype:  shepherdess__shepherdes  a woman shepherd
  subtype:  swineherd__pigman  a herder or swine

No statement uses or specializes herder; click here to add one.