1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
Etymology Explore the origin of the 'core words'.
Wordsense Learn about the wordsenses of the english term.

TOPIK 11000 KOREAN WORDS

☆☆ COURTESY; MANNERS lễ nghĩa, phép lịch sự ☆☆ COURTESY; MANNERS lễ tiết, nghi thức giao tiếp, lễ nghi phép tắc ☆ BEING FORMAL tính chất nghi lễ ☆ DECORUM; MANNERS lễ nghi thường tình ☆ FORMAL mang tính nghi lễ
HSK 3.0 11000 CHINESE WORDS
7 礼仪  lǐyí etiquette, ceremony

ENGLISH 6000 THEME WORDS

OXFORD 5000 CORE WORDS

TANAKA 6000 CORE WORDS