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
☆☆ PAINFUL; HURTFUL Adjective 苦痛 스럽다 痛苦，难受 khó khăn, đau khổ