Is the word covered a noun?

No, "covered" is not a noun. It is a verb (past participle of "cover").

Here's why:

* Nouns name people, places, things, or ideas.

* Verbs describe actions or states of being.

"Covered" describes a state of being covered, as in "The table is covered in a tablecloth."

Examples of nouns:

* Table

* Cloth

* Blanket

* Book

Examples of verbs:

* Cover

* Covered

* Uncover

* Conceal