fizzle vs hushing

fizzle and hushing both are nouns.

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

As nouns, fizzle and hushing are synonyms defined as:

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

Other synonyms of fizzle include hiss, hissing, sibilation.

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

fizzle (verb)	hushing (verb)
end weakly