dud vs fizzle

dud and fizzle both are nouns.

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

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

Other hypernyms of dud include bust, flop.

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

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

dud (verb)	fizzle (verb)
	end weakly