Here is a context clues worksheet on the noun bulwark. In preparing this worksheet I was mildly surprised to learn that this word also has use as a transitive verb (i.e. Someone bulwarks something) to my surprise.
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.