Question

Which words in this sentence are common nouns? During Montezuma's rule, the Aztec empire stretched from ocean to ocean. Choose all answers that are correct. A. Aztec B. stretched C. rule D. Montezuma's E. empire

Answer 1

Do you have any ideas of what it could be

Answer 2

Well, we can tell from the start that Aztec and Montezuma
are not common nouns due to their capitalization. They are
considered proper nouns because they require capitalization
at all times because they are names.
We also know that "stretched" and "rule" are not common
nouns because they are verbs.
That leaves us with "empire." Empire is your common
noun because it is not the official name.