As an adjective:
* The kids played nonstop for hours, completely oblivious to the time.
* The nonstop rain made it impossible to go for our usual walk.
* She worked nonstop for weeks to finish the project.
As an adverb:
* The music played nonstop at the party.
* We talked nonstop all night.
* The engine ran nonstop for the entire journey.
In a phrase:
* The flight is nonstop to Paris.
* We're having a nonstop party on Saturday.
* I need a nonstop vacation after all this stress.