Here is a worksheet on the Latin word root lex. It means “word,” “law,” and “reading.” This is a very productive root in English–n.b. that it morphs to leg for most legal terms–and yields a number of academic words, many of which you already know, like lexicon, lexical, and, of course, dyslexia. This root, when it morphs, gives us high-frequency words such as legal and illegal.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.