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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}	peaceful	friedlich
{adj}	peaceful	(inclined to peace; peaceable)	friedfertig
{adj}	peaceful	(motionless and calm; placid)	friedlich
{adj}	peaceful	(not at war or disturbed by strife or turmoil)	friedlich