Might-have-been is a phrase that refers to things that could have happened but did not. There are several words that are synonymous with might-have-been, including unrealized, potential, missed opportunity, and unrealized dream. The phrase is often used to express regret or disappointment over things that did not come to fruition. Other synonyms for might-have-been include hypothetical, speculative, and alternate possibility. These words are often used in discussions about what could have happened if certain decisions had been made differently. Ultimately, might-have-been is a powerful phrase that conveys a sense of loss and missed potential, but it can also be a source of inspiration for future endeavors.