Word banks can help you spell more accurately by providing whole words.
They can also support language for specific writing tasks when grids are designed by a teacher or therapist.
Word banks are usually a feature of paid software
Clicker 7 has premade and customizable word grids templates (paid desktop software)
Clicker apps (Clicker Sentences, Clicker Connect, Clicker Docs, and Docs Plus) are the iOS and ChromeOS versions of specific templates in the desktop software