Thanks for this, hev - I enjoyed browsing the list. However, I noticed they got two things wrong: license and principal/principle.

License is the verb; licence is the noun. (Hence "This restaurant is licensed to sell liquor," but "I need to renew my driver's licence next month.")

Principal is both a noun (as in the case of a high school principal) and an adjective (the principal actor in a production, for example). You could even have a principal principle.....