The Wordly Wise 3000 series supports vocabulary development for students needing extra practice beyond what is learned from reading books. It is helpful for students for whom English is a second language as well!
My son started this book his 8th grade year and would like to continue moving on to the next book for his next year of homeschooling. I made up tests for him after each chapter which involved him matching the words to the proper definitions. He has really enjoyed this study.