hissing vs sibilation

hissing and sibilation both are nouns.

Word	Noun	Adjective	Verb	Adverb
hissing	Yes	No	No	No
sibilation	Yes	No	No	No

As nouns, hissing and sibilation are synonyms defined as:

hissing and sibilation: a fricative sound (especially as an expression of disapproval)

Other synonyms of hissing include fizzle, hiss, hushing.

hissing (noun)	sibilation (noun)
a fricative sound (especially as an expression of disapproval)	pronunciation with a sibilant (hissing or whistling) sound
	a fricative sound (especially as an expression of disapproval)