What is the noun of quiet?

The noun of "quiet" is quiet itself. It can function as both an adjective and a noun.

Here's how it works:

* Adjective: "The room was quiet." (Describing the state of the room)

* Noun: "We enjoyed the quiet of the countryside." (Referring to the state of calmness itself)

Sometimes, other words are used to describe the noun form of "quiet":

* Silence: This emphasizes the complete absence of sound.

* Calm: This emphasizes a feeling of peace and tranquility.

* Tranquility: This suggests a state of deep serenity.

The choice of word depends on the specific context and the nuance you want to convey.