horsemaster

noun2

1. •
   One who takes care of horses, which may include breeding or training.

   • Ben had “Buck” Commings with him who also hails from the “Bad Lands”, but “Buck” will only lasso horses. He will be horsemaster at camp. — 1938
2. •
   (rare) An expert equestrian.

   • A horsemaster at heart, she finds instant enjoyment atop a fast steed. — 1968