http://a4esl.org/q/h/vocabulary.html
The initial appeal of this site to me is that it is a self- study vocabulary site. Students read a definition/example of the vocab word in question, and they have the option of either answering it, or asking for a hint. These questions can also be used in the classroom, if the teacher prints them out, rather than make them computer based.
The categories are first identified in terms of their difficulty- easy, easy-medium, medium, medium-difficult, etc- and then further sectioned by specific themes, such as days of the week or parts of the body. You can also find words categorized by the letter they begin with. For teachers, this would be an easy resource if you're looking for vocab for a specific purpose.
While I like some aspects of this site, I wouldn't use this as the entire vocabulary lesson, but rather, only one aspect of the lesson. I don't find the tests to be communicative tasks, because they don't include anything but the tests. I like the categorization of the words/tests, but I don't think the activities are strong enough to stand on their own.
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