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
☆☆ PAIN Noun 苦痛痛苦 sự đau khổ, sự thống khổ, sự đau đớn
☆☆ PAIN; ACHE Noun 痛楚，疼，痛 sự đau đớn