purist

One who practices or urges strict correctness, especially in the use of words.

One who aims scrupulously at purity, particularly in the choice of language; one who is a rigorous critic of purity in literary style.

One who maintains that the New Testament was written in pure Greek.

One who aims at excessive purity or nicety, esp. in the choice of language.

One who maintains that the New Testament was written in pure Greek.

Of or pertaining to purism

An advocate of purism

someone who insists on great precision and correctness (especially in the use of words)