1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Core Words Familarize yourself with the 'core words'.
Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Etymology Explore the origin of the 'core words'.

{n}	grammar	(book describing grammar)	Grammatik {f}, Sprachlehre {f}
{n}	grammar	(in computing: formal system specifying the syntax of a language)	Grammatik {f}
{n}	grammar	(rules for speaking and writing a language)	Grammatik {f}, Sprachlehre {f}
{n}	grammar	(study of internal structure and use of words)	Grammatik {f}, Grammatiktheorie {f}