A person who pretends to have more knowledge or skill than he really has

A Renegade
B Apostle
C Charlatan
D Apotheosis

Correct Answer: Charlatan

One word substitute is Charlatan.

Renegade: a person who deserts and betrays an organization, country, or set of principles.
Apostle: each of the twelve chief disciples of Jesus Christ.
Charlatan: a person falsely claiming to have a special knowledge or skill.
Apotheosis: the highest point in the development of something; a culmination or climax.

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