There are a few different synonyms you could use for the word "inoculator", depending on the context in which you are talking about them. For example, if you are talking about someone who administers vaccines or immunizations, the words "vaccinator" or "immunizer" could work well. Another option might be to use the term "injectionist", which would be appropriate for someone who injects medicines or fluids into the body. Additionally, if you are talking about someone who introduces an organism or substance into another environment, you could use terms like "implanter", "introducer", or even "seeder" as synonyms for "inoculator".