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
☆☆ BULLETIN BOARD; NOTICE BOARD Noun 揭示板公告牌，告示板 bảng thông báo
☆ NOTICE Noun 公告文通告，公告，公文 bảng thông báo