mimicker

adjective

1. inclined to copy; imitative
2. of, or having the nature of, mimicry or imitation
3. make-believe; simulated; mock: mimic tears

noun

transitive verb mimicked, mimicking

1. to imitate in speech or action, often so as to ridicule
2. to copy closely; imitate accurately
3. to resemble closely; have or take on the appearance of: animals that mimic their environment