There are several synonyms for the word "errorist," which is a term used to describe someone who consistently makes errors or mistakes. One synonym is "blunderer," which refers to someone who tends to make careless mistakes or act impulsively without thinking things through. Another synonym is "faultfinder," which describes somebody who is quick to point out faults or mistakes in other people or situations. Additionally, "bungler" is a synonym for "errorist," as it implies someone who is clumsy or inept in their handling of certain tasks or situations. Other possible synonyms include "miscalculator" and "goofball".