* Verb: "Nonstop" as a verb is rarely used, but it means "to continue without stopping." For example:
* "The music nonstopped for hours."
* Adjective: "Nonstop" as an adjective means "without stopping" or "continuous." For example:
* "He had a nonstop flight to Paris."
* "They engaged in nonstop conversation."
So, the part of speech depends on how it is used in a sentence.