The term 'field of canines' refers to the field of DENTISTRY, which is a nine-letter word. DENTISTRY is the branch of medicine that is concerned with the diagnosis, prevention, and treatment of diseases, disorders, and conditions of the oral cavity, commonly in the form of dental surgery. It is also known as the science of teeth and their surrounding structures. Dentists are responsible for providing preventive care, diagnosing and treating oral diseases, and performing corrective procedures such as fillings, crowns, bridges, and root canals.