Spell checkers aren't wothout danger either... I never used the English version, but the German version of the Word 2000 spell checker will most definitely offer you words that simply arem't words! With most misspelled words you'll get one or two correct words, one of which is usually the one you intended to use, but also at least one or two non-existing nonsense words.
For example turning the US minister of foreign affairs into a US minister for Russian affairs... (I'm dead serious and it was a freshly installed software and nobody had messed with the dictionary!)... but while that doesn't make sense it's still a word. However, Word is also known for offering words you won't ever find in any dictionary, like "vorhubergehend"...

Let me tell an old joke... A man comes to the display of a computer store and reads a sign: "Microsoft spel chekar vor sail. Worgs grate!" [Linked Image]