It is designed as a clone of the standard Unix spell program, and implemented as a wrapper for Ispell. Spell accepts as its arguments a list of files to read from. In addition, when called with no file name arguments, Spell assumes that it should process standard input. Spell is most useful when used in conjunction with other programs, because its output is minimalistic.
Human users are usually more comfortable with verbose output.
Unavailable unless this dictionary was installed with Ispell. Example Using GNU Spell is quite simple. Here's an example, which you can try when in the directory of Spell's source code. Also include in your message the operating system you are using, the output that the program produced, the output you expected, which options you invoked Spell with, and any other details that you think may be useful. Keep in mind that facts are more usually more helpful than guesses.