sibilate vs hiss

sibilate is not a noun while hiss is a noun.

Word	Noun	Adjective	Verb	Adverb
sibilate	No	No	Yes	No
hiss	Yes	No	Yes	No

As verbs, sibilate and hiss are synonyms defined as:

sibilate and hiss: make a sharp hissing sound, as if to show disapproval

Other synonyms of sibilate include siss, sizz.

As verbs, sibilate and hiss are synonyms defined as:

Other synonyms of sibilate include siss, sizz.

sibilate (noun)	hiss (noun)
	a cry or noise made to express displeasure or contempt
	a fricative sound (especially as an expression of disapproval)

sibilate (verb)	hiss (verb)
make a sharp hissing sound, as if to show disapproval	make a sharp hissing sound, as if to show disapproval
express or utter with a hiss	express or utter with a hiss
utter a sibilant	show displeasure, as after a performance or speech
pronounce with an initial sibilant	move with a whooshing sound