What does 者 mean?
者 is a Japanese noun meaning “person (same as 人 (ひと))” in English. It is written as 者 in kanji, もの in hiragana, and mono in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
彼はその強盗事件の従犯者として逮捕された。
He was arrested as an accessory to the robbery.