English Theasurus that shows all the ways the English word is translated from the original Greek and Hebrew.
English Theasurus from the Hebrew and Greek Strong's Dictionary
fortress 4013 -- mibtsar -- (de-, most) fenced, {fortress}, (most) strong (hold).
fortress 4692 -- matsowr -- besieged, bulwark, defence, fenced, {fortress}, siege,strong (hold), tower.