The term "overwriter" can refer to someone who writes excessively or inappropriately over previous writings. However, there are several synonyms for this word that can be used in varying context. One such synonym is "chatterbox," which is often used to describe someone who talks unnecessarily or excessively. Another synonym could be "overachiever," as these individuals often push themselves too hard and may overwrite their task list. "Verbosity" is another synonym that is often used to describe someone who writes or speaks too much, using too many words to express their thoughts. Finally, "garrulous" is another synonym that can be used to describe someone who is excessively talkative, using more words than necessary.