ピュアリスト

noun

purist

Refers to a person who insists on strict adherence to traditional rules, purity, or original principles, especially in art, language, or ideology.

• 彼かれは文ぶん法ぽうのピュアリストで、少すこしの間ま違ちがいも許ゆるさない。

  He is a grammar purist and won't tolerate even a small mistake.