Old flame is a term often used to describe an ex-lover or past romantic interest. However, there are several other words that could be used to convey the same meaning. Some synonyms for the term old flame include former flame, ex-paramour, erstwhile lover, former beau, past significant other, previous sweetheart, and ex-romantic interest. Each of these words has its own distinct connotation and can be used in various contexts. Whether you are talking about an old love interest or simply describing a past relationship, these synonyms for old flame can add a new level of complexity and nuance to your language.