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.

KOREAN 3.0	Eng	Wordtype	Etym.	Gb	Vie
☆☆	SURVEILLANCE; OBSERVATION; WATCH	Noun	监视	监视	sự giám sát