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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
☆☆☆	WORRY; CONCERN; CARE	Noun		担心，忧虑，担忧	nỗi lo
☆☆	WORRY; CONCERN	Noun	忧虑	忧虑，担忧，担心	sự lo ngại, sự lo nghĩ, sự lo lắng