[かい, kai] (n, n-suf) (1) storey; story; floor; (n) (2) (See 階・きざはし・1) stairs; (n, n-suf) (3) stage (in chronostratigraphy); (ctr) (4) counter for storeys and floors of a building; (P)#1097
[うぐいすばり, uguisubari] (n) nightingale (flooring); method of laying floors to deliberately make a noise (like a nightingale's call) when walked across (security feature)
[シャワーこうか, shawa-kouka] (n) (See 噴水効果) shower effect (theory that placing high-selling items on the upper floors of a department store will lead to increased sales in the lower floors)