A noun "mimic" represents a person who practices mimicry, such as a mime or a comic who does impressions.

An entity that mimics another entity, such as a disease that resembles another disease in its signs and symptoms; see the great imitator.

An imitation.

To imitate, especially in order to ridicule.

(biology) To take on the appearance of another, for protection or camouflage.

Pertaining to mimicry; imitative.

Mock, pretended.

(mineralogy) Imitative; characterized by resemblance to other forms; applied to crystals which by twinning resemble simple forms of a higher grade of symmetry.