Is a mark a pronoun

No, a mark is a noun, a singular, common, concrete noun; a Word small area on a surface having a different color from its surroundings, typically one caused by accident or damage; a school grade; a printed or written symbol that is not a letter or a number; the place that you try to hit.

The Word Mark is also a name for a male, a proper noun which must be capitalized.

A pronoun is a Word that takes the place of a noun in a sentence. The pronoun that takes the place of the common noun mark is it; the pronoun that take the place of the proper noun Mark is he as a subject and him as an object Example:

This is a water mark on the table, it is very difficult to remove.

Mark is going to pick us up. He will be here soon so we can wait for him out in front.