mimic

Short definition from Wiktionary

Verb

1. 1
   To imitate, especially in order to ridicule.
2. 2
   To take on the appearance of another, for protection or camouflage.

Noun

1. 1
   A person who practices mimicry; especially: A mime.
2. 2
   A person who practices mimicry; especially: A comic who does impressions.
3. 3
   An entity that mimics another entity, such as a disease that resembles another disease in its signs and symptoms; see the great imitator.
4. 4
   An imitation.
5. 5
   A fictional monster able to disguise itself as an inanimate object, commonly a treasure chest, often with the intent of luring adventurers into a trap.

Adjective

1. 1
   Pertaining to mimicry; imitative.
2. 2
   Mock, pretended.
3. 3
   Imitative; characterized by resemblance to other forms; applied to crystals which by twinning resemble simple forms of a higher grade of symmetry.