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.

ETYMOLOGY

KOREAN 3.0 Eng Wordtype Etym. Gb Vie
☆☆☆ UNCLE; PATERNAL UNCLE Noun 三寸叔叔，叔父 chú
☆☆ ONE'S MATERNAL UNCLE Noun 外三寸舅舅 cậu