masterpiece
US /ˈmæs.tɚ.piːs/
UK /ˈmæs.tɚ.piːs/

1.
a work of outstanding artistry, skill, or workmanship
:
•
The painting is considered a true masterpiece of the Renaissance.
•
His latest novel is a literary masterpiece.
a work of outstanding artistry, skill, or workmanship