reviewer; proofreader; copy editor
Refers to a person who checks the factual accuracy, consistency, and quality of written content, often in publishing or journalism. More formal than 校正者, which focuses on typographical errors.
He works as a reviewer at a newspaper company.
The reviewer checks the factual accuracy of the manuscript.
編集者 is a broader term for an editor who may also handle content planning and structure, whereas 校閲者 specifically reviews and verifies content.
Compound of 校閲 (review, check) and 者 (person). The exact historical derivation is uncertain, but the kanji are conventionally associated with the meaning of a person who reviews written work.