Immunise is a term often used in the medical field to describe the process of giving someone a vaccination to protect them from a particular disease. However, there are several different words that can be used interchangeably with the word immunise. Some synonyms include vaccinate, inoculate, protect, shield, guard, fortify, and defend. These words all suggest the idea of providing someone with an immunity to a particular disease or illness, either through a vaccination or other means. Regardless of the word chosen, the important thing is to ensure that people are protected against dangerous illnesses and diseases, helping to keep communities healthy and safe.