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
☆☆ UP AND DOWN Noun 上下 trên dưới
☆☆ TOP AND BOTTOM Noun 上下上下 trên dưới
☆ ORDER OF RANK; HIERARCHY Noun 位阶秩序上下秩序，官阶秩序 trật tự trên dưới