WordNet records no synonym and no antonym for scientific knowledge. 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.
knowledge accumulated by systematic study and organized by general principles
“mathematics is the basis for much scientific knowledge”
Synonyms, antonyms and the broader and narrower relations for scientific knowledge come from Princeton University’s WordNet. Full sources and licences.