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
☆☆☆ GRANDFATHER; GRANDPA Noun 爷爷，姥爷 ông nội, ông
☆☆ MATERNAL GRANDFATHER Noun 外 할아버지 外祖父，姥爷 ông ngoại