purist

purist
/ˈpjuərɪst; `pjʊrɪst/ n
person who pays great attention to correctness, esp in the use of language or in the arts 纯粹主义者, 力求纯正的人（尤指在语言的运用或艺术方面）
    Purists were shocked by the changes made to the text of the play. 抱有纯粹主义观点的人对该剧语言中的更改感到震惊.

牛津英汉双解词典