Upstairs
Part of speech: adverb
Definition: Up the stairs; on a higher floor or level.
Part of speech: adjective
Definition: located higher up a building. a pitched ball that is high, and usually outside the strike zone
Example sentence: As far as memories go, I was around for the very first WrestleMania. I was a young kid upstairs at my uncle's restaurant in a change room or staff room watching it, I think, illegally, on a black and white television.
Upstair
Part of speech: adjective
Definition: upstairs