The crossword solution for the term 'Sister Act Role' is 'NUN', which is a three-letter word. A NUN is a woman who has taken religious vows and is a member of a religious order, typically one devoted to prayer and contemplation. In the 1992 film Sister Act, Whoopi Goldberg plays the role of Deloris Van Cartier, a lounge singer who is placed in protective custody in a convent after witnessing a murder. She then disguises herself as a NUN and helps to revitalize the convent's choir.