If you can use them, here are two worksheets on the noun barbarism and the noun and adjective barbarian. I know these terms, in some instances, are considered impolitic. Nonetheless, these are words and concepts students should understand.
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.