It refers to a whirling mass of fluid, especially a whirlpool or whirlwind. It can also be used figuratively to describe a situation or process that draws people or things into it irresistibly.
Here are some examples:
* Noun: The water flowed down the drain in a vortex.
* Figurative Noun: The band's new album was a vortex of controversy.
Let me know if you have any other words you'd like to know the part of speech for! 😊