What do you call someone who falsely claims to possess greater expertise or abilities than they actually have?

Explanation

A 'charlatan' is a person who pretends to have knowledge or skills they do not truly possess. The other options do not fit this definition: 'Swindler' is a fraudster, 'Elevation' refers to a rise or glorification, 'Defector' is someone who abandons allegiance, and 'Impostor' is similar but not the term specifically used here.