inhibition has 3 distinct synonyms spread across 2 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
(psychology) the conscious exclusion of unacceptable thoughts or desires
Synonyms, antonyms and the broader and narrower relations for inhibition come from Princeton University’s WordNet. Full sources and licences.
(physiology) the process whereby nerves can retard or prevent the functioning of an organ or part
“the inhibition of the heart by the vagus nerve”
the action of prohibiting or inhibiting or forbidding (or an instance thereof)
“they were restrained by a prohibition in their charter”