WordNet records no synonym and no antonym for tradecraft. 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.
skill acquired through experience in a trade; often used to discuss skill in espionage
“instructional designers are trained in something that might be called tradecraft”
Synonyms, antonyms and the broader and narrower relations for tradecraft come from Princeton University’s WordNet. Full sources and licences.