wireless has 6 distinct synonyms spread across 3 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. Its one recorded opposite is wired.
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.
transmission by radio waves
an electronic receiver that detects and demodulates and amplifies transmitted signals
a communication system based on broadcasting electromagnetic waves
Synonyms, antonyms and the broader and narrower relations for wireless come from Princeton University’s WordNet. Full sources and licences.