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
☆☆☆ SADNESS; SORROW Noun 伤心，悲伤，悲痛，悲哀 nỗi buồn, nỗi buồn khổ, nỗi đau buồn, sự buồn rầu