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scanner has 3 distinct synonyms spread across 2 of its 4 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.
someone who scans verse to determine the number and prosodic value of the syllables
an electronic device that generates a digital representation of an image for data input to a computer
Synonyms, antonyms and the broader and narrower relations for scanner come from Princeton University’s WordNet. Full sources and licences.
a radar dish that rotates or oscillates in order to scan a broad area
a radio receiver that moves automatically across some selected range of frequencies looking for some signal or condition
“they used scanners to monitor police radio channels”