Double bill is a term that refers to the screening of two movies consecutively. Typically, the two movies have some similarities in their genre or theme. However, there are several synonyms for double bill, including twin bill, twofer, and double feature. Twin bill is an old term that refers to theatrical performances or concerts with two artists or groups. Twofer, on the other hand, is commonly used in the retail industry to mean two for the price of one. Lastly, double feature refers to the same concept as double bill, but the term is more associated with older movie theaters that used to show two movies for the price of one ticket.