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
☆☆ STONE; PEBBLE Noun 小石头，石子儿 viên sỏi, viên đá nhỏ
☆ EBB; FALLING TIDE Noun 退潮，落潮 triều kiệt, thủy triều xuống, nước triều xuống
☆ PEBBLE Noun 鹅卵石 viên sỏi, đá cuội