What is maintain as a noun?

"Maintain" isn't typically used as a noun on its own. It's primarily a verb meaning:

* To keep something in good condition: "The building needs regular maintenance to prevent deterioration."

* To continue to assert something: "She maintained her innocence throughout the trial."

* To support or provide for: "They couldn't maintain their family on such low wages."

However, you might see related nouns like:

* Maintenance: This refers to the act of keeping something in good condition. "The car requires regular maintenance."

* Maintenance worker: A person whose job is to keep equipment or facilities working properly.

* Maintainability: This refers to how easy it is to maintain a system or piece of equipment. "The software has high maintainability."

Let me know if you have any other words you'd like to explore!