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

HAN VIET: mật độ 密度

KOREAN 3.0	Eng	Wordtype	Etym.	Gb	Vie
☆	DENSITY	Noun	密度	密度	mật độ