upper
up-per
noun
An informal term for a stimulant drug.
"He was given an upper to stay awake."
adjective
Situated above another part or higher in position or rank.
"He lives on the upper floor."
noun
The part of a shoe or boot above the sole.
"The shoe's upper was made of leather."
Thesaurus
Synonyms: speed, amphetamine, pep pill, superior, upper berth, high
Antonyms: lower