Back

• linebacker

  (American football) the position of a defensive football player who plays close behind...

• quarterback

  (American football) the position of the football player in the backfield who directs...

• fullback

  (American football) the position of a back on a football team.

• halfback

  (American football) the position of a back on a football team.

• tailback

  (American football) the position of the offensive back on a football team who lines up...

• wingback

  (American football) the position of the offensive back who lines up behind or outside the...

Lineman

• center

  (American football) the position of the player on the line of scrimmage who puts the ball...

• guard

  (American football) a position on the line of scrimmage; "guards must be good blockers".

• tackle

  (American football) a position on the line of scrimmage; "it takes a big man to play tac...

• end

  (American football) a position on the line of scrimmage; "no one wanted to play end".

Formation

• backfield

  The offensive football players who line up behind the linemen.

• secondary

  The defensive football players who line up behind the linemen.

Also contains

• linemen

  The football players who line up on the line of scrimmage.