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}	life cycle	(course of stages through which an organism passes)	Lebenszyklus {m}
{n}	life cycle	(useful life of a product or system; developmental history of an individual or group)	Lebenszyklus {m}