sensation has 23 distinct synonyms spread across 3 of its 5 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.
a general feeling of excitement and heightened interest
“anticipation produced in me a sensation somewhere between hope and fear”
a state of widespread public excitement and interest
“the news caused a sensation”
the faculty through which the external world is apprehended
“in the dark he had to depend on touch and on his senses of smell and hearing”
Synonyms, antonyms and the broader and narrower relations for sensation come from Princeton University’s WordNet. Full sources and licences.