How does Wordstash work ?
First, Wordstash requires a registration. Click on sign up and open an account there. This service is completely free. Once logged in you can then key in a word to read its definition, hear its pronunciation or toggle its synonyms. You can also get tweets for the word you entered and see how it is used in a sentence from an online article.
On the right side of the website you will see a list of the most popular wordlists including "the 100 most common SAT words, World Capitals, Vocabulary From Jeopardy, and more"