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flash has 45 distinct synonyms spread across 10 of its 19 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 sudden brilliant understanding
“he had a flash of intuition”
a very short time (as the time it takes the eye to blink or the heart to beat)
“if I had the chance I'd do it in a flash”
a gaudy outward display
a burst of light used to communicate or illuminate
a short news announcement concerning some on-going news story
a bright patch of color used for decoration or identification
“red flashes adorned the airplane”
a lamp for providing momentary light to take a photograph
appear briefly
“The headlines flashed on the screen”
make known or cause to appear with great speed
“The latest intelligence is flashed to all command posts”
expose or show briefly
“he flashed a $100 bill”
protect by covering with a thin sheet of metal
“flash the roof”
emit a brief burst of light
“A shooting star flashed and was gone”
Synonyms, antonyms and the broader and narrower relations for flash come from Princeton University’s WordNet. Full sources and licences.