WordNet records no synonym and no antonym for reflexology. 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 study of reflex action as it relates to the behavior of organisms
massage to relieve tension by finger pressure; based on the belief that there are reflex points on the feet, hands, and head that are connected to every part of the body
Synonyms, antonyms and the broader and narrower relations for reflexology come from Princeton University’s WordNet. Full sources and licences.