Masterwork and Smash hit

Masterwork noun - Something (as a work of art) that is a great achievement and often its creator's greatest achievement.

Smash hit and masterwork are semantically related In some cases you can use "Smash hit" instead a noun "Masterwork".

Smash hit noun - An unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel).

Masterwork and smash hit are semantically related in success story topic. Sometimes you can use "Masterwork" instead a noun phrase "Smash hit".