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
☆☆☆	SON	Noun		儿子	con trai
☆☆	BIOLOGICAL SON	Noun	亲 아들	亲生儿子	con trai ruột
☆☆	ELDEST SON	Noun		大儿子	con trai cả, con trai trưởng