What is the common noun in this sentence Jamal finished his test early?

The common noun in the sentence "Jamal finished his test early" is test.

Here's why:

* Common nouns are general names for people, places, things, or ideas. They are not capitalized.

* Proper nouns are specific names for people, places, things, or ideas. They are capitalized.

In the sentence, "test" is a general term for a written assessment, while "Jamal" is a specific person's name (a proper noun).