The phrase "groom-to-be" is commonly used to refer to a man who is engaged to be married. However, there are several synonyms that can be used to describe him, including fiance, betrothed, intended, future husband, and partner. Fiance is the most commonly used alternative, and it is often interchangeable with groom-to-be. Betrothed is a slightly more formal term that suggests a deeper commitment, while intended is a more casual term. Future husband and partner both describe the same role in a relationship, but the latter is often used in more modern or non-traditional partnerships. Overall, while each term has a slightly different connotation, they all refer to the same exciting stage in a man's life.