What part of speech is crud?

"Crud" can be a few different parts of speech, depending on how it's used:

* Noun: When referring to something unpleasant or worthless.

* Example: "That old car is just a pile of crud."

* Interjection: An exclamation expressing annoyance or disgust.

* Example: "Crud! I forgot my keys!"

* Verb: Used informally to mean "to mess up" or "to ruin."

* Example: "I really crudded up that interview."

So, the part of speech depends on the context in which it's used.