What part of speech is ancient?

"Ancient" can be two parts of speech depending on how it's used:

* Adjective: Describing something as being very old, from a long time ago.

* Example: "The ancient ruins were impressive."

* Noun: Referring to a person or thing from a long time ago, especially belonging to a period before the Middle Ages.

* Example: "The ancients believed the earth was flat."

So, it depends on the context!