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Traitor
noun – One who betrays a trust or an allegiance.
Usage example: accused by her family of being a traitor when she sold their traditionally animal-friendly business to a competitor known to use animals for testing its products
Informer is a synonym for
traitor in
collaborator topic. You can use "Informer" instead a
noun "Traitor", if it concerns topics such as person who is disloyal.
Nearby Words:
trait,
traitorous,
traitress