To make it a noun, you need to use a related word or phrase, like:
* Humidity: This is the most common noun form, referring to the amount of moisture in the air.
* Humidness: This is a less common synonym for "humidity."
* Moistness: This refers to a state of being damp or wet, which could be related to humidity.
* Dampness: Similar to "moistness," this describes a slightly wet condition.
For example, you could say:
* "The humidity was high, making it uncomfortable to be outside."
* "The dampness in the air made the clothes feel clammy."