A flat surface or support that facilitates the ascent or descent of a stairway or step-ladder.
| STEP | linked | STAIRS | 
| STEP | linked | FOOT OR LEG | 
| STEP | linked | LADDER OR STAIRS | 
| FOOT OR LEG | linked | STEP | 
| FOOT OR LEG | linked | STEP | 
| LADDER OR STAIRS | linked | STEP | 
| Id | Concept in source | Conceptlist | 
|---|---|---|