階級

N1 階層 kaisou class, level, stratum, hierarchy N1 等級 toukyuu grade, class N1 同級 doukyuu the same grade, same class N2 学級 gakkyuu class N2 高級 koukyuu high class; first-rate N2 上級 joukyuu advanced level, high grade, senior N2 初級 shokyuu elementary level N2 段階 dankai gradation, grade, stage N3 級 kyuu class, grade, rank, level

N2 階 kai / kizahashi storey, stair, counter for storeys of a building N1 級 kyuu class, rank, grade