The term 'Dentist's DRILL' can be broken down into two words: 'Dentist' and 'DRILL'. The first word, 'Dentist', refers to a professional who specializes in the diagnosis, prevention, and treatment of diseases and conditions of the oral cavity. The second word, 'DRILL', is a tool used by dentists to cut or shape teeth, remove decay, and prepare cavities for fillings. The crossword solution for this term is 'Reamer', which is a type of DRILL bit used to enlarge or shape holes in hard materials such as metal or wood. Reamers are often used in dentistry to create larger openings in teeth for fillings or other treatments.