the most important word in the article which the class should learn

I think the most important word is antiquities. It is important because we always use the word 'old' to describe something that is in the past. I think the word 'old' is not the only one that can describe the thing in the past. There is the new word 'antiquities' is also a word that we can use. So in the next time, we do not need to have the word 'old' in the most of the article.