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spike has 11 distinct synonyms spread across 6 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.
a transient variation in voltage or current
sports equipment consisting of a sharp point on the sole of a shoe worn by athletes
“spikes provide greater traction”
(botany) an indeterminate inflorescence bearing sessile flowers on an unbranched axis
a sharp rise followed by a sharp decline
“the seismograph showed a sharp spike in response to the temblor”
a sharp-pointed projection along the top of a fence or wall (or a dinosaur)
a long, thin sharp-pointed implement (wood or metal)
“one of the spikes impaled him”
any holding device consisting of a rigid, sharp-pointed object
“the spike pierced the receipts and held them in order”
a large stout nail
“they used spikes to fasten the rails to a railroad tie”
Synonyms, antonyms and the broader and narrower relations for spike come from Princeton University’s WordNet. Full sources and licences.
manifest a sharp increase
“the voltage spiked”