1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

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}	hobby horse	(child's toy)	Steckenpferd {n}
{n}	hobby horse	(topic about which someone loves to talk)	Steckenpferd {n}