The word "Grammaticaster" is quite obscure and seldom used. It refers to someone who is a pedantic and overbearing critic of other people's grammatical errors. Synonyms for the word include "grammar Nazi," "language police," "grammar snob," and "language purist." These are individuals who are overly concerned with enforcing grammatical rules and correcting others rather than focusing on the content of what is being said. While it is important to use proper grammar to communicate effectively, it is equally important to avoid being too critical and imposing on others. Using these synonyms can help to describe someone who is too fixated on grammar and lacks balance in their approach to communication.