* Adjective: Describing something that is unclean or soiled.
* Example: "The car was dirty after the drive through the mud."
* Noun: A substance or material that is unclean.
* Example: "There was a lot of dirt on the floor."
* Verb: To make something unclean.
* Example: "Don't dirty your clothes by playing in the mud."
So, the part of speech for "dirty" depends on its context in the sentence.