AWE:OxAmE spelling
From Hull AWE
This list is from Garner 2002, which says that "Here are 25 of the most commonly misspelled words in the English language. Naturally, they're spelled correctly here:"
Three contractions are also constantly being misspelled: it's, they're, and you're. See its, their & your.
Among the less usual words that are difficult to spell are iridescent, kimono, naphtha, and syzygy.