Commonly Misspelled Words in English Select a reference source and click on any word in a list to get a definition, pronunciation or translation of that word to your language. Take a quiz on spelling. http://www.esldesk.com/vocabulary/misspelled-words
Daily Vocabulary Test A new short three question multiple choice quiz every day to test your vocabulary knowledge. http://www.zdaily.com/vocabulary.htm
Dave's Choice Words Dave's Choice Words are fun, free vocabulary building exercises. http://www.davidfisco.com/dcwindex.php
English Words from Chinese English words which have come into the language from Chinese. http://spotlightongames.com/quote/chinesewords.html
Exploring Words Another advanced English-vocabulary program for long-distance learners of all ages, everywhere. http://www.wordexplorations.com/
Grandiloquent Dictionary A collection of 2000 words which are often omitted from dictionaries, and are in danger of being eliminated from the English language. http://www.islandnet.com/~egbird/dict/dict.htm
Heenan's Universal Dictionary A collection of weird and wonderful words and their alternate meanings; sources, too, where available. http://www.wordskit.com/words/
International House of Logorrhea An online dictionary of obscure and unusual words and obsolete terms to help enhance vocabulary; over 15,500 English words with brief definitions. http://phrontistery.info/ihlstart.html
The Phrontistery A site for lovers of obscure and unusual words, featuring a dictionary of rare words, word lists of vocabulary on specific topics, essays and discussions on etymology, vocabulary and language usage. http://phrontistery.info/
Vocab Vitamins Introduces an uncommon word or phrase each day, along with a definition. Includes archives, and a daily email service. http://www.vocabvitamins.com/
VocabularyMail.com A free daily email broadcast of one to three words, their definitions, and explanations and examples of how to use them effectively in your speech and writing. http://vocabularymail.com/
Word Info An English vocabulary dictionary with free searches of words from Latin and Greek sources. http://www.wordinfo.info