hushing vs fizzle

hushing and fizzle both are nouns.

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

As nouns, hushing and fizzle are synonyms defined as:

hushing and fizzle: a fricative sound (especially as an expression of disapproval)

Other synonyms of hushing include hiss, hissing, sibilation.

hushing (noun)	fizzle (noun)
a fricative sound (especially as an expression of disapproval)	a complete failure
	a fricative sound (especially as an expression of disapproval)

hushing (verb)	fizzle (verb)
	end weakly