S: (n) linebacker, line backer ((American football) the position of a defensive football player who plays close behind the line of scrimmage)
S: (n) quarterback, signal caller, field general ((American football) the position of the football player in the backfield who directs the offensive play of his team) "quarterback is the most important position on the team"
S: (n) fullback ((American football) an offensive position in the backfield)
S: (n) halfback ((American football) an offensive back usually positioned behind the quarterback and to the side of the fullback)
S: (n) tailback ((American football) the position of the offensive back on a football team who lines up farthest from the line of scrimmage)
S: (n) wingback ((American football) the position of the offensive back who lines up behind or outside the end)
S: (n) center ((American football) the position of the player on the line of scrimmage who puts the ball in play) "it is a center's responsibility to get the football to the quarterback"
S: (n) guard ((American football) a position on the line of scrimmage) "guards must be good blockers"
S: (n) tackle ((American football) a position on the line of scrimmage) "it takes a big man to play tackle"
S: (n) end ((American football) a position on the line of scrimmage) "no one wanted to play end"
S: (n) backfield (the offensive football players who line up behind the linemen)
S: (n) secondary (the defensive football players who line up behind the linemen)
S: (n) linemen (the football players who line up on the line of scrimmage)