NGS Style Manual‎ > ‎- T -‎ > ‎

troop, trooper, troupe, trouper

troop:            assemblage of persons or animals; a company or band

trooper:       cavalryman, state police officer, state trooper

troupe:         a band, especially of actors, singers, etc.

trouper:       a member of a troupe, a real trouper