The difference between Atheist and Theist
When used as nouns, atheist means a person who believes that no deities exist , whereas theist means one who believes in the existence of a god or gods.
Atheist is also adjective with the meaning: of or relating to atheists or atheism.
check bellow for the other definitions of Atheist and Theist
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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.
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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.
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Atheist as an adjective:
Of or relating to atheists or atheism; atheistic.
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Theist as a noun:
One who believes in the existence of a god or gods.