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 |
|---|---|---|