Don’t be afraid of words. Building your English vocabulary isn’t that difficult. Just try to read as much as possible, watch many movies in English, use the Internet and so on. Here you have some very interesting sites:
–http://www.mattelscrabble.com/en/adults/games/index.html Some classic games like Scrabble and hang man in English.
–http://www.learnenglishfeelgood.com/vocabulary/ Some advanced vocabulary quizzes.
–http://www.eflnet.com/vocab/index.php Here you will find some advanced vocabulary lists plus pronunciation and examples.