
Stair
Physical Movement
Stair is often associated with physical movement, implying exertion or effort.

She was out of breath after taking the stairs instead of the elevator.
Directional Use
Stair can be used with directions to specify ascending or descending between floors.

He hurried down the stairs when he heard the news.
Countable Object
Stair is often used in the plural form 'stairs' to refer to the entire staircase.

The old house had creaky stairs that echoed at night.
Compare with
GradationInclineLevelRiserRungStaircaseStepTread
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