What are the principle uses of nouns and pronouns in a sentence?

A noun is a Word for a person, a place, or a thing.

A pronoun is a Word that takes the place of a noun in a sentence.

The principle functions of a noun or a pronoun is as the subject of a sentence or a clause and as the object of a verb or a preposition.

EXAMPLES

Noun subject of a sentence: Aunt Jane made cookies for Jack and Jill.

Noun subject of a clause: The cookies that Aunt Jane made are for Jack and Jill.

Noun object of verb: Aunt Jane made cookies for Jack and Jill.

Noun object of a preposition: Aunt Jane made cookies forJack and Jill.

Pronoun subject of a sentence: She made cookies for Jack and Jill.

Pronoun subject of a clause: The cookies that she made are for Jack and Jill.

Pronoun object of verb: Aunt Jane made them for Jack and Jill.

Pronoun object of a preposition: Aunt Jane made cookies for them.