"Sword swallower" is a term used to describe an entertainer who is able to swallow swords and other sharp objects without causing harm to themselves. However, there are various synonyms that can be used to describe this unusual talent. One such synonym is "blade dancer" which suggests a graceful, almost dance-like performance. Another alternative might be "sharp object performer" or "blade manipulator" which both encompass a broader range of sharp objects and may be more appropriate for performers who incorporate a variety of objects into their act. Ultimately, the term used will depend on the specific nature of the performance and the style of the individual performer.