Definition of "speller"

Without insisting on a difference between the inventors and the spellers of words, Socrates makes short work of this case.

2005, Michael W. Riley, Plato's Cratylus: Argument, Form, and Structure, page 124

But Word's spelling program still isn't fully integrated into the word processor. For one thing, any changes and corrections you make from the speller's menus don't appear on-screen until you get back to your original file.

1987, PC Mag, volume 6, number 17, page 358