Word Nerd
A nerd who is good at word-related subjects, such as grammar and foreign languages, rather than math and science like a stereotypical nerd.
Example:
Person A: Did you know that the little dot on top of a lowercase letter "i" is called a "tittle"?
Person B: You're such a Word Nerd.
Person A: Did you know that the little dot on top of a lowercase letter "i" is called a "tittle"?
Person B: You're such a Word Nerd.