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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}	travel	(act of traveling)	Reise {f}
{n}	travel	(plural: series of journeys)	Reisen {f-p}
{v}	travel	(to be on a journey)	reisen
{v}	travel	(to pass from here to there; to transmit)	sich übertragen, sich fortpflanzen
{v}	travel	(to travel throughout)	bereisen