upper - noun

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

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

upper - adjective

• the topmost one of two
• higher in place or position
• superior in rank or accomplishment

upper - thesaurus

amphetamine   speed