- A Word A Day - Today's Word - Audio clip, definition, and example usage.
- 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.
- Daily Vocabulary Test - A new short three question multiple choice quiz every day to test your vocabulary knowledge.
- Dave's Choice Words - Dave's Choice Words are fun, free vocabulary building exercises.
- English Words from Chinese - English words which have come into the language from Chinese.
- Exploring Words - Another advanced English-vocabulary program for long-distance learners of all ages, everywhere.
- Grandiloquent Dictionary - A collection of 2000 words which are often omitted from dictionaries, and are in danger of being eliminated from the English language.
- Heenan's Universal Dictionary - A collection of weird and wonderful words and their alternate meanings; sources, too, where available.
- International House of Logorrhea - A online dictionary of obscure and unusual words and obsolete terms to help enhance vocabulary; over 15,500 English words with brief definitions.
- MT Desk - Word lists by medical speciality including Alternative Medicine, Cardiovascular, Dermatology/Skin, and other areas of care.
- 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.
- Vocab Vitamins - Introduces an uncommon word or phrase each day, along with a definition. Includes archives, and a daily email service.
- Vocabulary Activities for Standardized Tests - Interactive activities on word lists based on themes.
- 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.
- Vokabeln.net - Web-based vocabulary trainer with a multilanguage interface. Features shortcuts for special characters used in ~100 languages.
- WordGenie - An electronic vocabulary enhancement system that runs as a screen saver on your PC computer.
