-ce, -se
Nouns ending in -ce with -se verb forms: American English and British English both retain the noun/verb distinction in advice / advise and device / devise, but American English has abandoned the distinction with licence / license and practice / practise (where the two words in each pair are homophones) that British spelling retains. American English uses practice and license for both meanings.
Also, American English has kept the Anglo-French spelling for defense and offense, which are usually defence and offence in British English; similarly there are the American pretense and British pretence; but derivatives such as defensive, offensive, and pretension are always thus spelled in both systems.
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