"upper" in the noun sense
1. upper berth, upper
the higher of two berths
piece of leather or synthetic material that forms the part of a shoe or boot above the sole that encases the foot
"Uppers come in many styles"
3. amphetamine, pep pill, upper, speed
a central nervous system stimulant that increases energy and decreases appetite used to treat narcolepsy and some forms of depression
"upper" in the adjective sense
the topmost one of two
higher in place or position
"the upper bunk"
"in the upper center of the picture"
"the upper stories"
superior in rank or accomplishment
"the upper half of the class"
Source: WordNet® (An amazing lexical database of English)
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