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
☆☆ BEING STRONG; BEING POSITIVE; BEING ACTIVE Noun 积极积极 sự tích cực
☆☆ EXTREMELY; UTTERLY Adverb 至极 히 十分，极其 cực kì, vô cùng
☆☆ GREATLY; EXTREMELY Adverb 极 히 极其 cực kì
☆ THE SOUTH POLE; SOUTH POLE REGION; ANTARCTICA Noun 南极南极 cực nam, nam cực
☆ NORTH POLE Noun 北极北极 cực bắc, bắc cực
☆ EXTREME Noun 极极点，极限 cực độ, tột điểm, cùng cực
☆ WHOLE-HEARTED Adjective 至极 하다 至诚，无微不至，热情 chí tình, tận tâm, tận tụy, chí nghĩa
☆ GEUK Affix 极 (无对应词汇) cực~