Plagiarism is a serious offence and those who engage in it are often referred to as plagiarisers. However, there are a number of other words that can be used to describe individuals who steal or copy someone else's work. These include copycat, imitator, infringer, pirate, thief, counterfeiter, mimic, and forger. While each of these words has a slightly different connotation, they all refer to someone who is dishonestly passing off the work of another as their own. It is important to avoid plagiarism and to always give credit where credit is due, otherwise, you risk being labeled as one of these synonyms for plagiariser.