Charlatan means someone who pretends to special knowledge or skill that they do not possess.
Charlatan is a noun.
Synonyms: cheat, fraud, swindler, trickster, impostor.
Be certain that your electrician is not a charlatan before you agree to have him replace your fan.
When the students came to know that their friend was a charlatan they had him fired.
Durga learned that her husband, the charlatan, was already married to another woman.