trooper

Short definition from Wiktionary

Noun

1. 1
   A soldier of private rank in cavalry or armor.
2. 2
   A cavalry horse; a charger.
3. 3
   A soldier.
4. 4
   A troopship.
5. 5
   Ellipsis of state trooper.
6. 6
   A mounted policeman.
7. 7
   Misspelling of trouper (“one who stoically endures adversity”) .
8. 8
   Alternative letter-case form of trooper.

Verb

1. 1
   To work as a trooper.
2. 2
   To work steadily at an unpleasant job without complaint.