Ghost peppers, Carolina Reapers, and Trinidad Scorpions are all hot. I raise a few Ghost peppers, and have bought some of the Scorpion peppers. A little bit of those goes a long way....
A freeper sent me some ghost pepper seeds a few years ago and I raised one or two. They were hot but nothing like the Reaper. If a Ghost is an 2 KT atom bomb a Reaper is a 50 KT Hydrogen bomb. Words fail.