Enforcer is a role in which kind of sport?

Enforcer is an unofficial role in ice hockey. The term is sometimes used synonymously with "fighter", "tough guy", or "goon". An enforcer's job is to deter and respond to dirty or violent play by the opposition. When such play occurs, the enforcer is expected to respond aggressively, by fighting or checking the offender. Enforcers are expected to react particularly harshly to violence against star players or goalies.

Enforcers are different from pests, players who seek to agitate opponents and distract them from the game, without necessarily fighting them. The pest's primary role is to draw penalties from opposing players, thus "getting them off their game", while not actually intending to fight the opposition player (although exceptions to this do occur). Pests and enforcers often play together on the same line, usually the fourth line.