Wasps and hornets do make different looking nests. At least, as best I can tell. The paper wasps make those honeycomb shaped ones and the hornets (including what are called yellow jackets here) make the cone shaped ones with the hole at the bottom. But there are a lot of different types of both, so maybe the little nasties we're calling yellow jackets are just a different variety of wasp. It's easy to tell the difference, tho. They have a different flight pattern, they're definitely more aggressive, and their bodies are more bee shaped than the wasps that we find on those honeycomb nests. We have both hanging around our hummingbird feeders, and they definitely behave differently!
