operator has 3 distinct synonyms spread across 2 of its 5 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
(mathematics) a symbol or function representing a mathematical operation
an agent that operates some apparatus or machine
“the operator of the switchboard”
Synonyms, antonyms and the broader and narrower relations for operator come from Princeton University’s WordNet. Full sources and licences.
someone who owns or operates a business
“who is the operator of this franchise?”
a shrewd or unscrupulous person who knows how to circumvent difficulties
a speculator who trades aggressively on stock or commodity markets