Choose the most appropriate word that can substitute the given group of words.

One who pretends to be what he is not

Hypocrite

A "hypocrite" is a person who pretends to be what they are not, particularly in terms of their beliefs, opinions, or virtues. They may feign a certain character or behavior that is contrary to their true nature or values. In the given group of words, "one who pretends to be what he is not," the word "hypocrite" accurately captures the concept of someone who presents a false image or pretense.

"Director" refers to a person who guides, supervises, or manages a particular activity or organization. While they may have a role in shaping or overseeing behavior, it does not specifically relate to pretending to be someone they are not.

"Creator" refers to someone who brings something into existence or generates something new. It does not capture the idea of pretending or falsifying one's identity.

"Acrobat" refers to a person who performs impressive physical feats, often involving agility and balance. It does not relate to pretending or misrepresenting one's true self.

Therefore, "Hypocrite" is the most appropriate word to substitute the given group of words as it directly represents a person who pretends to be what they are not, displaying a false appearance or behavior contrary to their true nature or beliefs.