upper

A central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression.

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.

Higher in place or position.

“the upper bunk”

“in the upper center of the picture”

Superior in rank or accomplishment.

“the upper half of the class”

The topmost one of two.