Quote Originally Posted by Shauna View Post
They are all "undead" creatures, but they're just different brands. Boiling them down to undead creatures that wander around is inclusive of many monsters, but we still have distinctions between zombies and vampires even though they can both be described as such.
Vampires are not simply known in fiction as just wandering corpes that have been revived through some different ways while a mummy and a zombie has often many similiarities in fiction.

But a mishmash of what Shiny and Shorty said is probably the best answer.
Going by what I said a few times, that I do not talk about real mummies which lie around in museums and the thing that many differences are between many zombies and they are still considered zombies it is not so easy to go with such an answer. A zombie can be an individual or not. A mummy can be one or not. A zombie can be revived religiously or not. A mummy can be revived religiously or not. A zombie can eat flesh or not. There are those types and then the other.