Supertitle is a term used in theatre to describe the translation or transcription of words that appear above the stage during a performance. In case you're looking for synonyms for this term, you can consider some other options such as surtitle, caption, subtitle, above-titling, over-titling, head title, or superimposed title. These terms are often used interchangeably and refer to the same concept of projecting text on a screen above the stage. It is important to note that supertitles serve as an aid for audiences who may not be familiar with a particular language or dialect, and their purpose is to help make the performance more accessible.