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Synonyms for Upper (same or very similar meaning)

WordNet sense 1 (the higher of two berths):
upper berth

WordNet sense 2 (a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression):
amphetamine, speed, pep pill

WordNet sense 3 (situated at the top or highest position):
top

WordNet sense 4 (of or characteristic of high rank or importance):
superior

WordNet sense 5 ((literal meaning) being at or having a relatively great or specific elevation or upward extension (sometimes used in combinations like `knee-high')):
high


From the ODE community, based on WordNetadd/edit