The Oxford American Dictionary Vocabulary Builder includes 50 lessons, with each lesson focusing on an area of language. It's written by Keith Folse, a vocabulary expert, to use with the Oxford American Dictionary or Oxford Advanced American Dictionary. You can use it for in class work, or students can use it at home.
Lessons 1-6 Dictionary skills
Lessons 7-1 Which word
Lessons 12-15 Spelling
Lessons 16-19 Pronunciation
Lessons 20-27 Parts of speech
Lessons 28-31 Informal language
Lessons 32-36 Collocations
Lessons 37-40 Content areas
Lessons 41-45 Oxford 3000 words
Lessons 46-50 Academic word list