What you have to remember about the English and American languages is that they have developed separately for the last few hundred years. The Americans have plenty of words that are almost unheard of over here - US teenagers talking about sophomores on TV, how many of our kids bother to find out what they are? I don't think that our language is superior but if you are composing a piece of English writing surely it should be composed in English? Try reading an American newspaper, you will find that the vocabulary is broader and more colourful that in some of our tabloids.