purist
Definitions
A person who insists on absolute adherence to traditional rules or structures, especially in language or style.
Someone who believes that a thing should be kept in its original, pure form and opposes any changes or modifications.
Examples
As a coffee purist, he refused to add any sugar or cream to his freshly brewed espresso.
The film purist argued that the original black-and-white version was far superior to the colorized remake.
Synonyms
traditionalist perfectionist stickler formalist doctrinaire pedant