Anything in the capsicum genus is in fact a chilli. Some, such as what Aussie's call Capsicums or more commonly known as bell peppers are just chillies with absolutely no heat, some have read up to 500 SHU but that is not even worth crediting.
Capsicums, supermarket chillies, habaneros ect...
All the superhots are also a part of this genus.
HOWEVER.
If you are after a non-chilli burn, and you don't want to digest hydrochloric adic then radishes and wasabi are your other options. Horseradish in fact has been developed to the point where you can get a serious burn everytime, you can't build a tolerance, and is so easy to obtain. I eat the nagas now pickled as a condiment to class as a 'hot' product, when I want a nice burn, but not to be inedible - you build a tolerance to the oil that makes chilli heated.
Good luck on your pepper ventures and welcome to the forum!