In looking up the correct spelling of rhythm for the billionth time this year alone, I ran across stats indicating that the word rhythm is only misspelled 12% of the time.
Of course the word misspelled looks like it's misspelled, but that's not the point right now.
The top misspelled - or "spelled otherwise" - words are:
minuscule at 68% of the time millennium 57% embarrassment 55% (embarrassing 35%) occurrence 44% (occurring 37%) accommodate 40% (accommodation 39%) perseverance 36% supersede 35-50% (superseded 44%) noticeable 35% harass 34% inoculate 34%