Death is shortsighted. If Dracula did slaughter all life on Earth, he would end up going hungry FOREVER. Or, Death would finally cease to exist as he no longer had a function.
Death may be a brilliant tactician, but he proves you don't need a fancy vocabulary to be smart. He struggles for a proper term to describe bringing Dracula back and is very vulgar.
The reason Trevor tells Sypha that "Treffpr" is a terrible name is pretty self-explanatory. She is pregnant with the next heir of the Belmont line.