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WordNet records no synonym and no antonym for night letter. 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 cheaper form of telegram sent for delivery the next day
Synonyms, antonyms and the broader and narrower relations for night letter come from Princeton University’s WordNet. Full sources and licences.