Coessentially is a word used to describe something that is essential or necessary. However, there are many synonyms that can be used in place of this word to convey the same meaning. Some synonyms for coessentially include crucially, indispensably, vitally, fundamentally, essentially, and importantly. These words all imply that something is necessary or important in a particular context or situation. By using synonyms like these, writers and speakers can convey their meaning clearly and concisely, while also adding variety to their language. It is important to choose the appropriate synonym based on the intended meaning and tone of the text or conversation.