σοφιστής

Etymology
From, from.

Noun

 * 1) A master of one's craft
 * 2) One who is wise, prudent, a philosopher
 * 3) teacher, tutor
 * 4)  One who makes a profit off of false wisdom: cheat, swindler

Usage notes
The reputation of the teachers at Athens came into decline in the fifth century BC, and thus came the connotation of cheat. This varies with time in relation to the general approval or disapproval of the paid teachers.