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

☆☆ THE LOWEST; BOTTOM (sự) thấp nhất
HSK 3.0 11000 CHINESE WORDS
7 底层  dǐcéng first floor, understratum, bottom, underside, the lowest rung, first, undersurface, underlayer, ground level, ground floor, first/ground floor, substratum, first_floor, basement

ENGLISH 6000 THEME WORDS

OXFORD 5000 CORE WORDS

TANAKA 6000 CORE WORDS