masterwork; masterpiece; crowning work; one's magnum opus; work of the highest quality
pride of place; most prominent; top-ranking
person of paramount authority; supreme wielder of power
senior leadership; senior leader; upper echelon (of power); top-ranking officer
highest ever; record-high; highest on record
record high; all-time high
highest score; highest number of points; top grade; peak altitude; highest point
best (highest) record; new record
supreme leader; ultimate leader
maximum temperature; highest temperature; (today's) high
highest institute of education
supreme council; high council; Supreme Soviet (former USSR)
largest amount of money; maximum amount of money
highest level; high-water mark
oldest; most advanced age
(the) best of one's life; lifetime ...
chief executive officer; CEO
chief executive officer; CEO
highest price; price ceiling
maximum punishment; maximum sentence
supreme law (of the land)
chief operating officer; COO
Supreme Court of Judicature (Scotland); High Court (England); Parlement (France)
chief financial officer; CFO
General Headquarters (office of the Supreme Commander of the Allied Powers); GHQ
General Headquarters (office of the Supreme Commander of the Allied Powers); GHQ
Supreme Commander for the Allied Powers (in Japan); SCAP
magnum opus; (one's) best work
Supreme Public Prosecutor's Office
tournament win in the highest division
highest honorifics; honorific language mainly reserved for speaking of or to a member of the Imperial family