Entry for a contest of the game: "Scribblenauts Unmasked".
I think Superman is faster
A little information about these characters.
-Flash (Barry Allen), the fastest man alive. Created by writer Gardner Fox and artist Harry Lampert, the original Flash first appeared in Flash Comics #1 (January 1940)
-Superman (Clark Kent) is a fictional character, a superhero that appears in comic books published by DC Comics, and is widely considered an American cultural icon. Superman was created by writer Jerry Siegel and artist Joe Shuster, high school students living in Cleveland, Ohio, in 1933; the character was sold to Detective Comics, Inc. (later DC Comics) in 1938. Superman first appeared in Action Comics #1 (June 1938) and subsequently appeared in various radio serials, television programs, films, newspaper strips, and video games.