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signal has 8 distinct synonyms spread across 3 of its 6 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.
any nonverbal action or gesture that encodes a message
“signals from the boat suddenly stopped”
any incitement to action
“he awaited the signal to start”
an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
communicate silently and non-verbally by signals or signs
“He signed his disapproval with a dismissive hand gesture”
1 of the 6 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for signal.
Synonyms, antonyms and the broader and narrower relations for signal come from Princeton University’s WordNet. Full sources and licences.