The term "reincarnationist" refers to someone who believes in the concept of reincarnation or the repeated cycle of birth, death, and rebirth. However, there are several synonyms for this word that convey the same meaning. Some of the common synonyms for reincarnationist include transmigrator, metempsychosist, samsarist, rebirthist, and metensomatist. These terms are often used interchangeably to describe individuals who believe in the cycle of rebirth. While the word "reincarnationist" is the most commonly used, it is always good to have alternative synonyms to adequately communicate the exact meaning of the concept.