It is possible to connect M-x hippie-expand with M-x
ispell-complete-word. A simple way of doing it could be to add the
later function to the
Either by using the M-x customize-variable
or by adding the following line to your .emacs configuration:
(add-to-list 'hippie-expand-try-functions-list 'ispell-complete-word t)
Now calling hippie-expand will, as a last resort, use ispell
completion to complete words.