imposter

The hospital discovered that the new doctor was actually an imposter with no medical training.

用法提示：此处 imposter 作为可数名词，指冒名顶替他人身份的人。

Several imposters tried to gain access to the exclusive event by using fake invitations.

用法提示：此处 imposters 为复数形式，指多个骗子或冒名者。

She felt like an imposter among the seasoned professionals at the conference.

用法提示：此处 imposter 表示因不自信而产生的“冒充者”心理感受。