Refers to a person or thing that is not genuine; often used for people pretending to be someone else, but also for counterfeit goods.
あの人は偽者だ。
That person is an impostor.
このブランド品は偽者かもしれない。
This branded item might be a fake.
偽者 (same reading にせもの) refers to a fake person or impostor, while 偽物 refers to a fake object or thing.
Standard kanji spelling.
Uncommon variant using 贋 (counterfeit).
Formed from 偽, “false,” and もの, “person or thing.” The latter is written 者 when an impostor is meant and 物 for a counterfeit object.