masterwork
/ˈmæstərˌwɜrk/
noun
- A creation (such as a painting, book, or piece of music) that is considered the best work of an artist or creator, or an exceptionally great piece of work.
- Many critics consider this novel to be the author's masterwork.
- The museum's new exhibit features a masterwork by the Renaissance painter.
- The architect spent a decade designing what would become his masterwork.