階層

N1 階級 kaikyuu class, rank, grade N2 高層 kousou tall, high rise N2 大層 taisou very much, greatly N2 段階 dankai gradation, grade, stage N3 一層 issou even more, still more N5 ～階 ～kai counter for stories (floors) of a building N5 階段 kaidan stairs N5 〜階 kai counter for floors

N2 階 kai / kizahashi storey, stair, counter for storeys of a building N2 層 sou stratum, social class, layer