WordNet records no synonym and no antonym for van der waal's forces. 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.
relatively weak attraction between neutral atoms and molecules arising from polarization induced in each particle by the presence of other particles
Synonyms, antonyms and the broader and narrower relations for van der waal's forces come from Princeton University’s WordNet. Full sources and licences.