Coadjutant is a rarely used word that means someone who assists or works with someone else, especially in a clerical or administrative capacity. However, there are several synonyms that can be used in place of coadjutant. Some of the most common synonyms include assistant, aide, helper, associate, collaborator, deputy, partner, supporter, and adjunct. Depending on the context, each of these words can be used interchangeably with coadjutant to convey the same general meaning. So the next time you encounter the word coadjutant in your reading or writing, remember that there are plenty of synonyms available to help you express your ideas more clearly and succinctly.