Here is a context clues worksheet on the verb enhance. It’s only used transitively. I doubt there is any question about the fact that this is a word high school students should know and be able to use by the time they receive their diplomas.
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.