Downstair vs. Downstairs

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Difference Between Downstair and Downstairs
Downstairadjective
(dated) downstairs
a downstair bedroomDownstairsadjective
A floor lower than the current one.
Downstairadjective
on or of lower floors of a building;
the downstairs (or downstair) phoneDownstairsadverb
living, stepping, or coming down the stairs
Downstairsnoun
The lower floor of a house, at ground level.
Downstairsnoun
The genitalia
The wind lifted up her skirt and I caught a glimpse of her downstairs.ADVERTISEMENT
Downstairsadjective
on or of lower floors of a building;
the downstairs (or downstair) phoneDownstairsadverb
on a floor below;
the tenants live downstairs