premise: A player-coach may be a head coach.
hypothesis: William Laird Cowher ( born May 8 , 1957 ) is a former professional American football coach and player in the National Football League ( NFL ) . A player-coach ( also playing coach , captain-coach , or player-manager ) is a member of a sports team who simultaneously holds both playing and coaching duties . A player-coach may be a head coach or an assistant coach .