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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}	surge	((electricity) electrical spike)	Überspannung {f}, Spannungsstoß {m}
{n}	surge	((nautical) swell of the sea)	Brandung {f}
{n}	surge	(sudden transient rush or flood)	Aufwallung {f}, Schwall {m}, Welle {f}, Woge {f}