Conventionist refers to a person who follows established customs and practices. There are several synonyms for conventionist like traditionalist, conservative, conformist, classicist, and formalist. Traditionalist often refers to someone who prefers the old ways and does not like change. Conservative is often used to refer to someone who is resistant to change and tends to follow established norms. Conformist refers to someone who follows the rules and norms of society. Classicist is often used to describe someone who has a preference for classical forms and traditions, while a formalist is someone who emphasizes adherence to form and structure. All these synonyms for conventionist have a similar meaning and reflect a person's adherence to established norms and traditions.