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WordNet records no synonym and no antonym for light second. 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.
the distance light travels in a vacuum in one second; approximately 300,000 kilometers
Synonyms, antonyms and the broader and narrower relations for light second come from Princeton University’s WordNet. Full sources and licences.