How many nouns are in the following sentence you hit nail on head?

Let's break down the sentence "You hit the nail on the head":

* You: This is a pronoun, not a noun.

* Hit: This is a verb.

* The: This is a definite article, not a noun.

* Nail: This is a noun.

* On: This is a preposition.

* The: This is a definite article, not a noun.

* Head: This is a noun.

Therefore, there are two nouns in the sentence: nail and head.