shock has 24 distinct synonyms spread across 10 of its 17 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.
the feeling of distress and disbelief that you have when something bad happens accidentally
“his mother's death left him in a daze”
a reflex response to the passage of electric current through the body
“subjects received a small electric shock when they made the wrong response”
(pathology) bodily collapse or near collapse caused by inadequate oxygen delivery to the cells; characterized by reduced cardiac output and rapid heartbeat and circulatory insufficiency and pallor
“loss of blood is an important cause of shock”
an instance of agitation of the earth's crust
“the first shock of the earthquake came shortly after noon while workers were at lunch”
a pile of sheaves of grain set on end in a field to dry; stalks of Indian corn set up in a field
“corn is bound in small sheaves and several sheaves are set up together in shocks”
a bushy thick mass (especially hair)
“he had an unruly shock of black hair”
a mechanical damper; absorbs energy of sudden impulses
“the old car needed a new set of shocks”
surprise greatly; knock someone's socks off
“I was floored when I heard that I was promoted”
Synonyms, antonyms and the broader and narrower relations for shock come from Princeton University’s WordNet. Full sources and licences.
strike with disgust or revulsion
“The scandalous behavior of this married woman shocked her friends”
strike with horror or terror
“The news of the bombing shocked her”
collect or gather into shocks
“shock grain”