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
☆☆ BEING PROFESSIONAL Noun 专门的/颛门的专业的，专门的 tính chuyên môn
☆☆ PROFESSIONAL Determiner 专门的/颛门的专业的，专门的 mang tính chuyên môn