HBO is one of the most popular premium cable networks in the United States, and it has several competitors. STARZ (5 letters) is a premium cable network owned by Lionsgate that offers movies and original programming. AMC (3 letters) is a cable network owned by AMC Networks that primarily airs classic films and television shows. SHO (3 letters) is a premium cable network owned by CBS Corporation that offers movies, documentaries, and original programming. TMC (3 letters) is a premium cable network owned by ViacomCBS that focuses on independent films and documentaries. SHOWTIME (8 letters) is a premium cable network owned by ViacomCBS that offers movies, documentaries, and original programming. All of these networks are considered rivals to HBO.