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Unless you are fortunate to have VERY dedicated students it needs speaking and writing as well.
You might try some charts of base words, suffixes and affixes to illustrate word familys.
For many learners, using flow diagrams or spidergrams can be a very helpful vocabulary tool. There are nice free downloadable shapes available at this site:
There's an article on the subject of using mind maps and spidergrams to help the teaching of lexis at this site by Jon Lewis: How to Use Mind-Maps in Language Learning