Kreator is thrash, but if you'd replace their vocalist with a death metal one, it could pass as melodeath. So, depends on the band.Way off. Death Metal is far closer to Thrash Metal than Melodic Death Metal is. Thrash lacks the amount of melody Melodic Death features although of course there are some exceptions.
Oh, I will delete links to conspiracy theory websites and shit, so don't even post it here. I won't have it.