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
☆☆☆ BUSINESS TRIP Noun 出张出差 sự đi công tác
☆☆ SWITCH Noun switch 开关 công tắc điện
☆☆ BUTTON Noun button 按钮 công tắc
☆ COOPERATION; COLLABORATION; COORDINATION Noun 协调协调，协作 sự cộng tác, sự phối hợp, sự hòa hợp