stratification;  hierarchization;  layering;  tiering
 stairs;  stairway;  staircase
 class;  level;  stratum;  layer;  hierarchy
 (social) class;  rank;  grade
 stage;  step;  level;  rank;  order;  stairs
 floor below;  floor downstairs
 lower floor;  downstairs;  bottom of the stairs;  foot of the stairs
 floor above;  floor upstairs
 upper floor;  upstairs;  top of the stairs
 preliminary step;  first step
 upper floor (of a building)
 number of stairs or stories (storeys);  rank;  order
 upper floor (of a high-rise building)
 above-ground floor;  ground floor
 basement floor;  underground floor
 bottom floor;  lowest floor
 first system to rank officials into 12 levels (603 CE)
 relative rank accorded the gods of Shintoism
 all stages;  every level;  entire sequence
 name of a note in a movable do solfège system
 height of a storey;  floor height