What part of speech is circular?

"Circular" can be a few different parts of speech depending on how it's used in a sentence:

* Adjective: Describing something that is shaped like a circle or having a curved or winding path.

* Example: "The table has a circular top."

* Noun: A roundabout way of doing something or a circular route.

* Example: "The train took a circular route to the station."

* Verb: To move in a circle or to make something circular.

* Example: "The plane circular over the airport."

So, to know which part of speech it is, you need to look at its function in the sentence.