6 Best Sites to Improve your Vocabulary

1. Visuwords.com is a free online graphical dictionary.
2. SpellingCity.com is a Spelling & Vocabulary Website for Elementary, Middle, and High School students.
3. Vocabulary.co.il  is a fun site with lot of word games to learn and play. 
4. Freerice
   .com  is a free online game and learning tool, that allows players to raise rice to fight world hunger while learning through educational, multiple-choice games.
5. Merriam-Webster.com is a free online dictionary and  thesaurus,word games,vocabulary quiz and more.
6. Vocabulary.com  helps you learn new words, play games that improve your vocabulary, and explore language.