Strong's G3027 — λῃστής (noun)
lestes (lay"-stace') n.
1. a robber, bandit, armed thief
2. one who steals by use or threat of violence or by use of fear
3. (i.e.) the moneychangers in the temple robbed the people using the fear of God's disapproval
[from leizomai "to plunder"]
KJV: robber, thief 
Occurrences: 15