The phrase "at end" can be expressed in a variety of different ways using synonymous phrases or words. For example, "concludingly" or "ultimately" both refer to the end of something. Other options include "finally," "in conclusion," "lastly," or "at last." These phrases can be used to bring a sense of closure to a topic or subject. Additionally, the phrase "at the close" or "at the finish" can also be used in place of "at end." Overall, having multiple synonyms for phrases such as "at end" allows for more flexibility and variety in writing.