It sounds like you're trying to use words outside the Elder Scrolls universe. Here are translations you can use. I found them by going through the Dovahzul vocabulary I knew and comparing it to what you're looking for. Hopefully this helps you:

death = dinok

peril (noun) = daan (doom) or dilos (deadly), depending on how you use it

demise = oblaan (literally "end", but it's used for "end of life")

hell = either "hell" or "Oblivion"- "hell" is a direct word borrow from English, because "demon" and "hell" association is different from "daedra" and "Oblivion"

demon = "demon" or "deydra" - same reasons as above