The difference between Immort and Mort

Immort as a noun (internet, informal):

An immortal; an administrator of a multi-user dungeon.

Mort as a noun:

Death; especially, the death of game in hunting.

Mort as a noun:

A note sounded on a horn at the death of a deer.

Mort as a noun (UK, Scotland, dialect):

The skin of a sheep or lamb that has died of disease.

Mort as a noun (card games):

A variety of dummy whist for three players.

Mort as a noun (card games):

The exposed or dummy hand of cards in the game of mort.

Mort as a noun:

A great quantity or number.

Mort as a noun (internet, informal):

A player in a multi-user dungeon who does not have special administrator privileges and whose character can be killed.

Mort as a noun:

A three-year-old salmon.

Mort as a noun (obsolete, UK, thieves):

A woman; a female.