Pillarist is a term used to describe someone who is a staunch supporter of a particular idea or philosophy. There are several other words that can be used as synonyms for this term, including fanatic, zealot, enthusiast, devotee, adherent, and advocate. Each of these words expresses a strong commitment to a belief or cause, and can be used to describe someone who is deeply passionate about a particular subject. Whether it is religion, politics, or a specific organization, someone who is a pillarist is someone who is dedicated to furthering their beliefs and advocating for their cause, no matter what the cost.