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}	joke	(amusing story)	Witz {m}
{n}	joke	(something said or done for amusement)	Scherz {m}, Streich {m}
{n}	joke	(worthless thing or person)	Witz {m}
{v}	joke	(do for amusement)	scherzen, Witze machen, Spaß machen