spell checker

...identify “quarunteen“ as quarantine?? Or is this the iPad’s spell checker I should be blaming? The Yahoo Search engine identifies these kind of misspellings with one hand tied behind it’s back.... ???

I have the following spell checker script in AppleScript Objective C that is only catching some of the misspelled words. For instance, it seems to think the word "defnece" is spelled correctly. It also doesn't catch French or Spanish words even thought the language is set to English. Any ideas...