What part of speech is introvert?

"Introvert" is a noun. It refers to a person who is predominantly concerned with their own thoughts and feelings rather than with external things.

It can also be used as an adjective to describe something that is related to or characteristic of introverts.

For example:

* Noun: "She's an introvert and prefers spending time alone."

* Adjective: "He has an introverted personality."