The difference between Atheist and Atheitard

When used as nouns, atheist means a person who believes that no deities exist , whereas atheitard means an atheist.

When used as adjectives, atheist means of or relating to atheists or atheism, whereas atheitard means atheist.

check bellow for the other definitions of Atheist and Atheitard

Atheist as a noun (narrowly):

A person who does not believe in deities. A person who believes that no deities exist . A person who rejects belief that any deities exist (whether or not that person believes that deities do not exist). A person who has no belief in any deities, such as a person who has no concept of deities.
Atheist as a noun (uncommon):

A person who does not believe in a particular deity (or any deity in a particular pantheon), notwithstanding that they may believe in another deity.

Atheist as an adjective:

Of or relating to atheists or atheism; atheistic.