This is the 7546th most frequent German word.
grammatik
The set of rules for the structure and use of a language.
Here, "Grammatik" refers to the set of structural rules governing the composition of clauses, phrases, and words in the German language.
Die Grammatik der deutschen Sprache ist oft komplex.
The grammar of the German language is often complex.
In this sentence, "Grammatik" pertains to the study or rules of the English language.
Sie hat ein neues Buch über englische Grammatik gekauft.
She has purchased a new book about English grammar.
In this case, "Grammatik" denotes the concept of grammar as a subject being learned or acquired through practice.