ispell-highlight-spelling-error-overlay

ispell-highlight-spelling-error-overlay is a compiled Lisp function in `ispell.el'.

(ispell-highlight-spelling-error-overlay START END &optional HIGHLIGHT)

Highlight the word from START to END using overlays.
When the optional third arg HIGHLIGHT is set, the word is highlighted
otherwise it is displayed normally.

The variable `ispell-highlight-face' selects the face to use for highlighting.