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
☆☆☆ YESTERDAY Noun 昨天，昨日 hôm qua
☆☆☆ YESTERDAY Adverb 昨天，昨日 hôm qua
☆☆ YESTERDAY Noun 昨天，昨日 hôm qua
☆☆ YESTERDAY Adverb 在昨天，在昨日 hôm qua