WordNet records no synonym and no antonym for bouncing putty. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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.
a soft elastic silicone polymer that increases in elasticity with the application of force; used in the center of golf balls and as shock-absorbent padding
Synonyms, antonyms and the broader and narrower relations for bouncing putty come from Princeton University’s WordNet. Full sources and licences.