Features free vocabulary building exercises from David Fisco.

Collection of obscure and rarely used English words.

Alternative dictionary presents the not-so-known meanings of some words.

Free online dictionary of peculiar and weird meaning words. With links to dictionary websites of the similar theme.

Resource that has over 9,000 obscure words and their definitions.

Compiles word lists on a variety of topics along with a host of language resources.

Study Room makes it easy to build Vocabulary for SAT, GRE and ACT words. Contains videos, word list and mobile apps.

Build a better vocabulary in order to prepare for SAT tests or to develop better English skills.

Free mailing list of daily word features. Sends one to three words to subscribers' inboxes along with definitions, explanations, and information on usage.

Resource for a variety of dictionaries and vocabulary resources. With links to books, libraries, and word games.

Offers a method to expand vocabulary using digital flashcards. Includes FAQ and free registration.