king has 18 distinct synonyms spread across 6 of its 10 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is queen.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a male sovereign; ruler of a kingdom
preeminence in a particular category or group or field
“the lion is the king of beasts”
United States woman tennis player (born in 1943)
United States guitar player and singer of the blues (born in 1925)
United States charismatic civil rights leader and Baptist minister who campaigned against the segregation of Blacks (1929-1968)
a checker that has been moved to the opponent's first row where it is promoted to a piece that is free to move either forward or backward
one of the four playing cards in a deck bearing the picture of a king
(chess) the weakest but the most important piece
Synonyms, antonyms and the broader and narrower relations for king come from Princeton University’s WordNet. Full sources and licences.