Back to the original topic (and apologies if this was in an earlier thread!) I serendipitously found a site calledhttp://english2american.com. Far from complete or authorised, but it has its moments. I especially liked courgette / zucchini.

(BTW the spellcheck is splendidly egalitarian and recognises neither, but what less could you expect of our beloved spellcheck, technology's answer to Mrs Malaprop...)