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
☆☆ FLOW; PASS; CIRCULATE Verb 通 하다 通，畅通，顺畅 thông
☆ SKILLFUL; PROFICIENT Adjective 能通 하다 精通，擅长，精于 thông thạo