WordNet records no synonym and no antonym for military-industrial complex. 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 country's military establishment and the industries that produce arms and other military equipment
“we must guard against the acquisition of unwarranted influence, whether sought or unsought, by the military-industrial complex”
Synonyms, antonyms and the broader and narrower relations for military-industrial complex come from Princeton University’s WordNet. Full sources and licences.