Vocabulary consisting only from characters you are able to read
~階
~かい
(first, second, etc.) floor, story, gradejlpt5
2階
2かい
(1)storey/story/floor/(n) (2)stairs/(n,n-suf) (3)stage (in chronostratigraphy)/(ctr) (4)counter for storeys and floors of a building/(P); stairs; (n) stairs mix