Some resources with a vocabulary word of the day include Merriam-Webster.com and WordThink.com. Both of these resources offer a daily new word at no cost or registration online.
Merriam-Webster.com offers a different vocabulary word everyday. This website allows the learner to hear the pronunciation of the word. There is also a definition of the word and a sentence featuring the new word. Learners find a Did You Know section that offers any background or interesting information about the word.
WordThink.com provides a new word to learn each day with a definition and identification of the part of speech. The information includes usage of the word in a sentence. On the website, the last nine days worth of words are displayed with the current word.