ROUGHRIDER
roughrider
(noun) a horseman skilled at breaking wild horses to the saddle
Source: WordNet® 3.1
Etymology
Noun
roughrider (plural roughriders)
A horsebreaker.
(military, dated) A noncommissioned officer in the British cavalry whose duty is to assist the riding master.
(capitalized) A team member for the Canadian Football League's Saskatchewan Roughriders.
Source: Wiktionary
Rough"rid`er, n.
Definition: One who breaks horses; especially (Mil.), a noncommissioned
officer in the British cavalry, whose duty is to assist the riding
master.
Source: Webster’s Unabridged Dictionary 1913 Edition