Here are some examples:
* Mortal: subject to death
* Moribund: dying or near death
* Mortician: someone who prepares the dead for burial
* Mortuary: a place where the dead are kept before burial
* Mortification: extreme embarrassment or humiliation, often likened to death
It's important to note that "mor" is not a very common prefix, and its use is often restricted to words related to death.