This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. Up the stairs: raced upstairs.

ad. To or on a higher floor: went upstairs to go to bed.

ad. To or at a higher level: promoted upstairs to management.

adj. Of or located on an upper floor: an upstairs bedroom.

n. The part of a building above the ground floor.

ad. Up the stairs; on a higher floor or level.

ad. In the brain.

adj. located higher up a building.

adj. a pitched ball that is high, and usually outside the strike zone

n. See Upstairs in the Vocabulary.

ad. Up the stairs; in or toward an upper story.

adj. Being above stairs.

In or to an upper story: as, to go up-stairs.

Pertaining or relating to an upper story or flat; being above stairs: as, an up-stairs room.

n. An upper story; that part of a building which is above the ground floor.

ad. with respect to the mind

ad. on a floor above

adj. on or of upper floors of a building

n. the part of a building above the ground floor

"His side also got a lot of roof damage, so his upstairs is a big, fallen-plaster, mess."

downstairs   

part    portion   

Pears    Xers    affairs    airs    ayres    bares    bears    billionaires    blares    cares   

downstairs    bedroom    tomorrow    parlor    bathroom    apartment    lounge    closet    stair    go