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tracer has 1 distinct synonym spread across 1 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.
an investigator who is employed to find missing persons or missing goods
an instrument used to make tracings
(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
Synonyms, antonyms and the broader and narrower relations for tracer come from Princeton University’s WordNet. Full sources and licences.
ammunition whose flight can be observed by a trail of smoke