イミテーション

noun

imitation; fake; counterfeit

Refers to a copy or replica, often with a nuance of being not genuine. Commonly used for products, jewelry, or art.

• このバッグはイミテーションだから、本ほん物ものよりずっと安やすい。

  This bag is an imitation, so it's much cheaper than the real thing.

• 彼