fizgig vs firework

fizgig and firework both are nouns.

Word	Noun	Adjective	Verb	Adverb
fizgig	Yes	No	No	No
firework	Yes	No	No	No

As nouns, firework is a hypernym of fizgig; that is, firework is a word with a broader meaning than fizgig:

fizgig: a firework that fizzes as it moves
firework: (usually plural) a device with an explosive that burns at a low rate and with colored flames; can be used to illuminate areas or send signals etc.

Other hypernyms of fizgig include pyrotechnic.

fizgig (noun)	firework (noun)
a firework that fizzes as it moves	(usually plural) a device with an explosive that burns at a low rate and with colored flames; can be used to illuminate areas or send signals etc.
an implement with a shaft and barbed point used for catching fish