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
☆☆☆ BIRD Noun 鸟 chim
☆☆ KILLING TWO BIRDS WITH ONE STONE Noun 一石二鸟一石二鸟，一举两得 nhất cử lưỡng tiện, một công đôi việc
☆☆ NEST Noun 鸟巢，鸟窝 tổ
☆ MIGRATORY BIRD; BIRD OF PASSAGE Noun 候鸟 chim di cư