The Greeks Invented Grammar!
Grammar itself is a Greek word. Well derived from Greek Grammata.
Seriously though many common grammar and linguistics terms derive from Greek or are translations into Latin from Greek that were then translation into English.
Here's some words used to describe and analyse language that come from Greek.
Syntax Morph Lexicon Periphrasis Theory
Paradigm Synonym Philology Dialect Phonetics
Logic Semantics Analysis Etymology Topic