diadumenos

As nouns the difference between diadem and diadumenos

is that diadem is an ornamental headband worn as a badge of royalty while diadumenos is a form of ancient greek sculpture featuring a young man holding a knotted diadem (as the winner of a contest).

As a verb diadem

is to adorn with a diadem; to crown.

As nouns the difference between sculpture and diadumenos

is that sculpture is (uncountable) the art of shaping figures or designs in the round or in relief, professionally performed by a sculptor while diadumenos is a form of ancient greek sculpture featuring a young man holding a knotted diadem (as the winner of a contest).

As a verb sculpture

is to fashion something into a three-dimensional figure.