What are different ways nouns are used?

Nouns are used as the subject of a sentence or a clause; and as the object of a verb or a preposition. Examples:

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

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