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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'.

{n}	fertilizer	(a chemical compound created to have the same effect.)	Handelsdünger {m}
{n}	fertilizer	(a natural substance that is used to make the ground more suitable for growing plants)	Dünger {m}, Düngemittel {n}