The legendary football coach Stagg (5 letters) was an American innovator of the game, credited with inventing the tackling dummy and the huddle. He was also the first to use the forward pass and the first to coach in both college and professional football. Amos Alonzo Stagg coached at the University of Chicago from 1892 to 1932. The other legendary football coach Prop Warner (10 letters) was Glenn Scobey 'POP' Warner, who coached at several universities including Georgia, Cornell, Pittsburgh, Stanford, and Temple. He is credited with creating the single and double wing formations.