The term "one nighter" is commonly used to describe a brief romantic encounter between two individuals, often with no intention of a long-term relationship. However, there are several synonyms which can be used interchangeably to describe this kind of encounter. Some common synonyms are "fling," "hookup," "casual encounter," "one-night stand," and "no-strings-attached affair." Each of these terms highlights the temporary nature of the encounter and the lack of commitment between the individuals involved. While these synonyms may vary in their connotations and nuances, they all refer to a brief and often casual romantic encounter without any long-term connection.