Nouns
are names of a person, animal, place, event, etc. It could be proper or common
noun. Common nouns are names of general items and you find them everywhere you
go. These words are not usually capitalized, except if it is the starting word
in a sentence. Proper nouns on the other hand are more specific names and they
are capitalized.
In
the sentence:
During Montezuma's rule, the Aztec empire stretched from ocean to ocean.
The common nouns could be empire
and rule.
