impostor
Definition
A person who pretends to be someone else in order to deceive others, often to gain a benefit.
हिन्दी किसी लाभ प्राप्त करने के उद्देश्य से दूसरे का बनाव बनाकर धोखा देने वाला व्यक्ति।
Example
"The man was arrested when he tried to board the plane using a fake identity; he turned out to be an impostor."