Answer:
The nouns for the sentence “The boys broke the window with a baseball” are:
The boys: This is a common noun that names a group of people. It is also the subject of the sentence, meaning it performs the action of breaking the window.
The window: This is a common noun that names a thing. It is also the direct object of the sentence, meaning it receives the action of breaking.
A baseball: This is a common noun that names a thing. It is also the object of the preposition with, meaning it modifies the verb broke by telling how the boys broke the window.