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
☆☆☆	TEENAGER	Noun	靑少年	青少年	thanh thiếu niên
☆☆	BOY	Noun	少年	少年，男孩	thiếu niên, cậu thiếu niên