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
☆☆ REALLY; ACTUALLY Adverb 实际实际，实际上 thực tế, thực sự
☆ BEING ESSENTIAL; BEING SUBSTANTIAL Noun 实质的实质的，实质性的 thực chất, thực tế, thực sự