Verses with the word robber in the New Testament (2 verses):

John 10:1
Verily, verily, I say unto you, He that entereth not by the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber.

John 18:40
Then cried they all again, saying, Not this man, but Barabbas. Now Barabbas was a robber.