"Grammarian"
Linguists are prone to feel that the word "grammarian" should belong to them, not to prescriptivist scolds like the one in Elle Cordova's skit. And we often object even more strongly to "grammar" being used as the justification for condemnation of non-standard spellings, punctuation, word usage, etc., both because of the prescriptivist stance and also because the issues involved belong to aspects of usage (like orthography and lexical semantics) that are not part of what we call grammar.
But the OED's primary definition for grammarian is
An expert or specialist in grammar; a person who studies, writes about, or teaches grammar. Also more generally: an expert in or student of language; a linguist, a philologist; (formerly also) †a person of great learning (obsolete).
Sometimes (esp. from the 17th to early 19th centuries) somewhat depreciative, implying that a person is pedantic, too focused on minutiae, or overly concerned with rules and conventions.
The depreciative sense is illustrated in an 1806 citation from Henry Kirke White:
All that arithmeticians know, Or stiff grammarians quaintly teach.
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