Considering a known word to be misspelled..

Hi Folks,

I'm preparing some text for machine analysis, and I need to (a) do a 
normal spellcheck and (b) mark certain common words with special 
endings.  I'm hoping to use aspell's ncurses checker to also accomplish 
(b).  I'd need, for example, the word "know," when encountered, to be 
offered replacements of "knowAFF" and "know". I only have about six of 
those types of words that need to be so tagger. I'm reading through the 
docs, and trying a few things, but I'm having trouble imagining how to 
do this with aspell. Also, if it's not possible, how might I do it with 
another GNU software package.

Your help is deeply appreciated,
-judd