different between firework vs whizbang

English

fire +? work

firework (plural fireworks)

A device using gunpowder and other chemicals which, when lit, emits a combination of coloured flames, sparks, whistles or bangs, and sometimes made to rocket high into the sky before exploding, used for entertainment or celebration.

whiz +? bang

whizbang (plural whizbangs)

(dated) A type of firework that made a whiz before exploding
(dated) A small artillery shell
(by extension) Someone or something that holds an explosive amount of success, skill or effectiveness.
- c. 1967: Evening Standard
  She [Agatha Christie] has produced a whizzbang surprise which I am unable even to hint at without spoilsporting.

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