COPYCAT

copycat, imitator, emulator, ape, aper

(noun) someone who copies the words or behavior of another

Source: WordNet® 3.1

Etymology

Noun

copycat (plural copycats)

(informal, derogatory) One who imitates or plagiarizes others' work.

A criminal who imitates the crimes of another; specifically, a criminal who commits the same crime, especially a highly-publicized one, that has just been or recently committed by someone else.

Adjective

copycat (comparative more copycat, superlative most copycat)

Imitative; unoriginal.

Verb

copycat (third-person singular simple present copycats, present participle copycatting, simple past and past participle copycatted)

To act as a copycat; to copy in a shameless or derivative way

Source: Wiktionary