In general they are called fullbacks but if you have four defenders the inner two are called the stopper and the sweeper. The stopper plays ahead of the outer fullbacks and serves almost as a defensive midfielder while the sweeper plays behind the defense as the last defender before the goalie.
A back is a defender.
Neelanjan LakshmanPique
Yes, if you are a defender.
defender
Pressure of the defender
Defender...
a defender that is on the right side
Just about every team has a player with the number 5, normally a wing-defender.
The French name for a goalkeeper, such as that on a soccer field, is "gardien de but". The phrase is masculine.
John Terry of Chelsea and England.
goalie, defender, midfielder, forward
Today it is the Brazilian Danny Alaves.