Lee Schierer in McKean, PA
Yes, you can use some end mills in your wood shop. They can be used in a router. I would hesitate to use them in a drill press because most wood shop drill presses use jacobs taper chucks, which don't tend to like side load and vibration. Milling machines use a different type of chuck that locks into place and the head has bearings that are made for side loads.
Using the end mill for side to side cutting on a drill press can cause the bit and chuck to release from the quill without warning and drop on your work piece. It may also cause damage over time to the quill bearings.