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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'.

{adj}	stern	(having a hardness and severity of nature or manner)	streng
{adj}	stern	streng, ernst
{n}	stern	(the rear part or after end of a ship or vessel)	Heck {n}, Schiffshinterteil {n}, Hinterschiff {n}