What do you call a noun or pronoun in prepositional phrase?

A noun or pronoun in a prepositional phrase is called the object of the preposition.

Here's why:

* Prepositional phrases always start with a preposition (e.g., "on," "in," "to," "with," "for," "at," etc.) and end with a noun or pronoun.

* The object of the preposition is the noun or pronoun that the preposition "relates to" or "points to."

Example:

* "The cat sat on the mat."

* "on the mat" is the prepositional phrase.

* "mat" is the object of the preposition "on."

Let me know if you'd like more examples!