What is the part of speech for rapid?

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

* Adjective: Describing something that happens quickly.

* Example: "The car made a rapid stop."

* Noun: Referring to something that happens quickly.

* Example: "The rapid of the river was dangerous."

* Adverb: Modifying a verb, adjective, or another adverb to indicate speed.

* Example: "The child grew rapidly."

So, the part of speech for "rapid" depends on its context within a sentence.