The term 'otolaryngologist's colleagues' can be summarized as other medical professionals who specialize in the diagnosis and treatment of ear, nose, and throat conditions. One of these colleagues is an audiologist, who specializes in diagnosing and treating hearing and balance disorders. Audiologists use specialized equipment to measure a person's hearing ability and to identify any abnormalities in the ear or auditory system. Another colleague is an otologist, who specializes in diagnosing and treating diseases of the ear. Otologists may perform surgeries to treat ear infections, hearing loss, and other ear-related conditions. Lastly, a rhinologist specializes in diagnosing and treating diseases of the nose and sinuses. Rhinologists may perform surgeries to treat nasal obstruction, sinusitis, and other nasal-related conditions. The 8-letter crossword solution for this term is 'eardrums, ' which are the thin membranes that separate the outer and middle ear and vibrate when sound waves enter the ear.