Nazi death camps included gay people, atheists, gypsies and other groups as well as the Jewish religion; what's the correct way to refer to the entire tragedy?
There's no specific name for it that I've ever heard, though there are names for different aspects for it. "Holocaust" (or "Shoah" in Hebrew) refers to the persecution/murders of the Jews; "Porajmos" refers to what was done to the Roma. If you want to broadens things out to include all the atrocities committed between Germany and Russia starting in the '30s (which Tim Snyder does in Bloodlands, and it makes a lot of sense to look at them all in context) the artificial famine in Ukraine (which killed millions) could be included in the list. It's known as the "Holodomor."