That's the point, Sophie! They do sound different which is why it should be easy to know which is the noun and which is the verb, and which is why I ask what is wrong with people and why do so many get even 'advice' and 'advise' wrong, except that, as chelle7272 says, people are just lazy and cannot be bothered. By the way, jno, Americans do not 'tend to spell them the other way round'. they spell both nouns and verbs with a 'c', except for 'advice' and 'advise', though the Mirriam-Webster online dictionary does allow the 's' as a variant form.