I wish this had been made 8 years ago. If vocabulary is one of those things that you and your homeschooled kids struggle with then struggle no more. Worldly Wise 3000 has created a free online vocabulary program for grades k-12. You will love it and so will they. They have the lists, definitions, and games to enforce memorization.
This website is an extension of the Wordly Wise Workbooks series, but can be used independently.
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at this link