The term 'Royal Topper' refers to a type of headwear worn by royalty. The four crossword solutions for this term are DIADEM (6 letters), CORONET (7 letters), CROWN (5 letters), and TIARA (5 letters). A DIADEM is a type of headband, often made of precious metals and jewels, that is worn as a sign of royalty. A CORONET is a small CROWN, usually made of metal and jewels, that is worn by members of the nobility. A CROWN is a large, ornate headpiece, typically made of metal and jewels, that is worn by a monarch or other ruler. A TIARA is a type of headpiece, usually made of metal and jewels, that is worn by a woman as a sign of status.