Links to improve your vocabulary

Vocabulary is your friend. Improve the words you use and grammar mistakes will seem more minor.

Understanding vocabulary in context is a good skill for advanced students. Check out some tips here: 
http://testprep.about.com/od/readingtesttips/a/Vocab_Context.htm 

Love this dictionary site. You can create your own personal dictionary; just have to join (free membership). You can even have new words sent to your mobile phone every week. Check it out here:

http://www.learnersdictionary.com/

Here are the 500 most common words in English. A good activity to increase your reading speed is to time yourself for 10 seconds and read the list of words as fast as you can. Good exercise to repeat over and over again.
http://www.world-english.org/english500.htm

Tons of games are on this site (explore all it has to offer) that makes learning new words fun:
http://www.manythings.org/e/vocabulary.html

Here's a site that has vocabulary by topic: news, government, etc. Check it out:
http://stickyball.net/esl-vocab.html

Here you can practice and help feed people at the same time at this site:
http://freerice.com/#/english-vocabulary/1535