It is primarily an adjective, meaning:
* Relating to a nation or its people: "The national anthem" or "national holidays".
* Existing or occurring throughout a whole nation: "The national economy" or "a national park".
However, there are some instances where "national" can be used in a verb-like manner, though these are less common and often informal:
* To nationalize: This means to bring something under state control, such as a company or industry.
* To nationalize: This can also refer to the act of adopting or embracing something as a national symbol or custom.
It's important to note that these verb-like uses are not standard and are more likely to be used in specific contexts. If you're unsure whether it's appropriate, it's best to use a different word.