This is the 17508th most frequent Russian word.
травматолог
A traumatologist is a medical doctor specializing in the treatment of injuries and trauma.
Here, 'травматолог' is used as a subject, indicating the profession of the person who specializes in medical treatment of injuries.
Травматолог занимается лечением травм.
The traumatologist specializes in treating injuries.
In this sentence, 'травматолог' is used with the preposition 'к', indicating the direct object of the action of scheduling an appointment with a professional.
Я записался на прием к травматологу на следующей неделе.
I scheduled an appointment with the traumatologist for next week.
Here, 'травматолог' appears in the accusative case ('травматолога'), showing that this professional is the one being summoned for an emergency situation.