no both are for either they are personal watercarft it is company dependend on whether it is a jet ski, waverunner,
waverunner is a trade mark of yamaha
jet ski is a trade mark of kawaski
sea doos and polaris just go by either see doo and polaris and hondas used to be called wet jets but they dropped that name when they came out with their 4 stroke line.
i worked for a jetski shop everysummer in OCMD while i was in college