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A ladder has different amount of steps, depending on how big it is.
There is no word like lader. If you meant ladder, the steps of a ladder are called rungs.
The rungs of a ladder are the steps. Unless it is a step ladder, then they are just steps.
18 steps
steps
rungs
11 rungs.
Old English hlǣdder; related to Old High German leitara, meaning steps.
The steps of a ladder are called rungs.
rungs