How many nouns are in look before you leap?

Let's break down the phrase "look before you leap" to find the nouns:

* Look: This is a verb, not a noun.

* Before: This is a preposition, not a noun.

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

* Leap: This is a verb, not a noun.

Therefore, there are no nouns in the phrase "look before you leap."