List some differences between a script and a function

•  A function has a header whereas a script does not.
•  A function typically has end at the end of the file.
•  A function is called whereas a script is executed.
•  Arguments are passed to functions but not to scripts.
•  Functions can return arguments whereas scripts cannot.
•  The block comment is typically in the beginning of a script but 

under the function header.

•  The scope of variables is different: scripts use the base 

workspace, whereas functions have their own workspaces.