The term 'hero sandwich' is a generic name for a variety of sandwiches that are typically large and filled with various meats, cheeses, and vegetables. The crossword solutions for this term include SUB (3 letters), TORPEDO (7 letters), HOAGIE (6 letters), SUBMARINE (9 letters), GRINDER (7 letters), and POORBOY (7 letters). All of these terms refer to a type of hero sandwich, with the main difference being the type of bread used. The SUB is a sandwich made with a long roll, while the TORPEDO, HOAGIE, SUBMARINE, GRINDER, and POORBOY are all made with a type of Italian bread.