You're right, we can use it in the way of "Arrêter!" It's also a verb "Stopper", for instance, "Stopper un ballon". You may also encounter some collocations such as "faire du stop" (to Hitchhike). It's also a road sign "STOP". You may "griller un stop" (go through a stop sign). Hope it helps!

Yes, this word comes from ENglish, but you can absolutely use it in different contexts.