sibilation vs hissing

sibilation and hissing both are nouns.

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

As nouns, sibilation and hissing are synonyms defined as:

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

Other synonyms of sibilation include fizzle, hiss, hushing.

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