cribber

noun cribber

• plagiarist — an act or instance of using or closely imitating the language and thoughts of another author without authorization and the representation of that author's work as one's own, as by not crediting the original author: It is said that he plagiarized Thoreau's plagiarism of a line written by Montaigne. Synonyms: appropriation, infringement, piracy, counterfeiting; theft, borrowing, cribbing, passing off.
• plagiarizer — to take and use by plagiarism.
• stealer — to take (the property of another or others) without permission or right, especially secretly or by force: A pickpocket stole his watch.
• plagiary — plagiarism.
• cheater — A cheater is someone who cheats.