Etymology
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believer (n.)

1540s, "one who has faith in religion," agent noun from believe. From c. 1600 as "one who gives credence (to anything) without personal knowledge, one firmly persuaded of the truth of something."

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Definitions of believer

believer (n.)
a supporter who accepts something as true;
Synonyms: truster
believer (n.)
a person who has religious faith;
Synonyms: worshiper / worshipper
From wordnet.princeton.edu