The crossword solution for the term 'SUPERHERO NAME ENDER' is MAN, which is a three-letter word. The term 'MAN' is often used to refer to an adult male human being, but in this context it is being used as a suffix to denote a superhero name. This suffix is commonly used in comic books and other forms of popular culture to indicate that a character is a superhero. For example, Superman, Spiderman, and Batman are all superhero names that end with the suffix 'MAN'.