WordNet records no synonym and no antonym for abduction. 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.
the criminal act of capturing and carrying away by force a family member; if a man's wife is abducted it is a crime against the family relationship and against the wife
(physiology) moving of a body part away from the central axis of the body
Synonyms, antonyms and the broader and narrower relations for abduction come from Princeton University’s WordNet. Full sources and licences.