fizzle vs dud

fizzle and dud both are nouns.

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

As nouns, dud is a hyponym of fizzle; that is, dud is a word with a more specific, narrower meaning than fizzle:

Other hyponyms of fizzle include bomb, turkey.

fizzle (noun)	dud (noun)
a complete failure	an event that fails badly or is totally ineffectual
a fricative sound (especially as an expression of disapproval)	an explosion that fails to occur
	someone who is unsuccessful

fizzle (adjective)	dud (adjective)
	failing to detonate; especially not charged with an active explosive

fizzle (verb)	dud (verb)
end weakly