* Verb: This is the most common usage. It means to break into or stop something that is in progress, like "Please don't interrupt me while I'm working."
* Noun: This usage is less common, but it refers to a break or interruption. For example, "There was a brief interrupt in the power supply."
* Adjective: This usage is even less common than the noun form, and often refers to something that is being interrupted or discontinuous. For example, "The signal was interrupted by static."
So, the part of speech of "interrupt" depends on its context in a sentence.