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

☆☆☆ YES; YES SIR; YES MA'AM vâng, dạ ☆☆☆ YES SIR; YES MA'AM dạ, vâng ☆☆☆ YES ừ, ơi ☆☆ GOODNESS; OH GOSH ui, ôi ☆ LAMENTATION; DEPLORATION sự than thở, tiếng thở than
HSK 3.0 11000 CHINESE WORDS
7 唉  āi mild exclamation/sigh, Gosh!, My!

ENGLISH 6000 THEME WORDS

OXFORD 5000 CORE WORDS

TANAKA 6000 CORE WORDS