When I worked at the High School of Economics & Finance in Lower Manhattan, this context clues worksheet on the noun conglomerate was de rigueur. I’m hard pressed to imagine it isn’t a word high school students ought to know.
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.