Vaccination is a medical procedure that involves the administration of a vaccine to an individual in order to protect them from a particular disease. Vaccination can be administered in various ways, including INJECTION (9 letters), BOOSTER (7 letters), INOCULATION (11 letters) and SHOT (4 letters). INJECTION is the most common form of vaccination, where a needle is used to inject a vaccine into the body. BOOSTER shots are additional doses of a vaccine given at regular intervals to maintain immunity. INOCULATION is the process of introducing a weakened or dead form of a virus into the body to stimulate the production of antibodies. Finally, a SHOT is a slang term for an INJECTION.