Is the word opera a common noun?

The word "opera" can be both a common noun and a proper noun, depending on the context.

Common Noun:

* When used to refer to the art form in general, "opera" is a common noun.

* Example: "I enjoy listening to opera."

Proper Noun:

* When referring to a specific opera, such as "The Marriage of Figaro" or "La Traviata", "opera" becomes part of the proper noun.

* Example: "I saw a production of The Marriage of Figaro last night."

So, it's important to consider the context to determine whether "opera" is being used as a common noun or a proper noun.