Downstair vs. Downstairs

Downstairadjective

(dated) downstairs

Downstair

on or of the lower floors of a building, especially the ground floor; as, the downstairs (or downstair phone; the house has no downstairs bathroom. Opposite of upstairs.

Downstairadjective

on or of lower floors of a building;

Downstairsadjective

A floor lower than the current one.

Downstairsadverb

living, stepping, or coming down the stairs

Downstairsnoun

The lower floor of a house, at ground level.

Downstairsnoun

The genitalia

Downstairsadverb

Down the stairs; to a lower floor; as, she headed downstairs as soon as she heard the horn.

Downstairsadjective

on or of lower floors of a building;

Downstairsadverb

on a floor below;