WordNet records no synonym and no antonym for suborn. It is the only member of each of its synsets, 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.
incite to commit a crime or an evil deed
“He suborned his butler to cover up the murder of his wife”
procure (false testimony or perjury)
induce to commit perjury or give false testimony
“The President tried to suborn false witnesses”
Synonyms, antonyms and the broader and narrower relations for suborn come from Princeton University’s WordNet. Full sources and licences.