The term 'Gridiron Rusher' refers to a football player whose primary job is to run with the ball. The crossword solutions for this term are 'BACK', which is a four-letter word. This term is used to describe a running BACK, who is a position in American and Canadian football. A running BACK is typically positioned behind the quarterback and is responsible for carrying the ball from one end of the field to the other. They are also responsible for blocking and receiving passes.