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'.
Wordsense Learn about the wordsenses of the english term.

KOREAN 3.0	Eng	Wordtype	Etym.	Gb	Vie
☆☆☆	SIMPLICITY	Noun	单纯	单纯，单一	sự đơn giản, sự đơn thuần
☆☆	SIMPLY	Adverb	单纯 히	简单地，单一地	một cách đơn thuần
☆	SINGLE	Noun	单一	单一	sự đơn nhất