best seller noun
plural ∼ -ers [count] : a popular product (such as a book) that many people have bought
▪ She has written several best sellers. ▪ Her book is on the best-seller list.
▪ She has written several best sellers. ▪ Her book is on the best-seller list.
— best–sell·ing 
/ˈbɛstˈsɛlɪŋ/ adjective
▪ his best-selling novel
/ˈbɛstˈsɛlɪŋ/ adjective ▪ his best-selling novel
