The problem here is the appropriate part of speech, which hasn't been clarified. This whole thread has been an excellent example of the shortcomings of a spell-checking device - especially one which does not cover all the possible parts of speech. Something can be spelled correctly but misused, and a spell checker will let it pass because the spelling of the word is correct. A word that doesn't appear in the spell checker's list will be underlined as incorrect but may in fact be legitimate.
Someone with dyslexia is dyslexic (adjective) and
a dyslexiac (a noun, like insomniac) or
a dyslexic (noun and more frequently used in this sense). Confusion arises when two forms are written and pronounced identically but have different grammatical functions. Adding to the confusion, a spell-check tool will often contain one spelling and not the other (not necessarily the preferred or most common) and, as already stated, does not distinguish among the parts of speech or the proper definitions of words.
All of this is meant to say that simply finding a confirmation of a spelling somewhere isn't the whole answer. See below, sent to the New York Times as a response to commentary on this very subject (and already posted at least once here by me; apologies...):
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