roughrider
noun
rough·ri·der ˈrəf-ˈrī-dər 
1
: one who is accustomed to riding unbroken or little-trained horses
2
usually Rough Rider : a member of the first U.S. Volunteer Cavalry regiment in the Spanish-American War commanded by Theodore Roosevelt
Example Sentences
Recent Examples on the Web But McLaughlin said those deputies were assigned to specific events, not as full-time roughriders. 
Daniel Bice, Milwaukee Journal Sentinel, 10 Oct. 2017 The Roughriders defeated powerhouse Snohomish for the title. Jayda Evans, The Seattle Times, 21 June 2017 Roughriders (@sskroughriders) June 17, 2017Toronto Argonauts: Bear Woods, linebacker, Troy; Chandler Worthy, wide receiver, Troy. Mark Inabinett, AL.com, 19 June 2017
Daniel Bice, Milwaukee Journal Sentinel, 10 Oct. 2017 The Roughriders defeated powerhouse Snohomish for the title. Jayda Evans, The Seattle Times, 21 June 2017 Roughriders (@sskroughriders) June 17, 2017Toronto Argonauts: Bear Woods, linebacker, Troy; Chandler Worthy, wide receiver, Troy. Mark Inabinett, AL.com, 19 June 2017 Word History
First Known Use
1574, in the meaning defined at sense 1