What do you call a noun or pronoun that is in propositional phrase?

You don't call a noun or pronoun in a prepositional phrase anything special. It's simply the object of the preposition.

Here's a breakdown:

* Prepositional phrase: A group of words that begins with a preposition and ends with a noun or pronoun (the object of the preposition).

* Preposition: A word that shows the relationship between the noun or pronoun (object) and another word in the sentence (often the verb).

Example:

* "The cat sat on the mat."

* "on the mat" is the prepositional phrase.

* "on" is the preposition.

* "mat" is the object of the preposition.

In short, the noun or pronoun in a prepositional phrase is just called the object of the preposition.