bomb vs fizzle

bomb and fizzle both are nouns.

Word	Noun	Adjective	Verb	Adverb
bomb	Yes	No	Yes	No
fizzle	Yes	No	Yes	No

As nouns, fizzle is a hypernym of bomb; that is, fizzle is a word with a broader meaning than bomb:

Other hypernyms of bomb include bust, flop.

bomb (noun)	fizzle (noun)
an explosive device fused to explode under specific conditions	a complete failure
strong sealed vessel for measuring heat of combustion	a fricative sound (especially as an expression of disapproval)
an event that fails badly or is totally ineffectual

bomb (verb)	fizzle (verb)
throw bombs at or attack with bombs	end weakly
fail to get a passing grade