plagiarist
/ˈpleɪdʒərɪst/
noun
- A person who copies someone else's words, ideas, or work and pretends they are their own.
- She was accused of being a plagiarist after her song was found to be identical to an older hit.
- The teacher caught the plagiarist copying paragraphs from an online article.
- The journalist was fired for being a plagiarist and using other reporters' stories without credit.
Antonyms