Christine, this nifty tool which in fact acts as two tools in one, so to speak, has got the very cumbersome name planer thicknesser.
Sometimes written planer/thicknesser. If you need to look at a picture to confirm it's the right thing, most powertool fabricators stock them. I've given you a couple of sites. Perhaps you are looking for a more industry sized machine? The second site shows a more robust version.