sibilate vs talk

sibilate is not a noun while talk is a noun.

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

As verbs, talk is a hypernym of sibilate; that is, talk is a word with a broader meaning than sibilate:

Other hypernyms of sibilate include mouth, speak, utter, verbalise, verbalize.

sibilate (noun)	talk (noun)
	the act of giving a talk to an audience
	an exchange of ideas via conversation
	idle gossip or rumor
	a speech that is open to the public
	discussion; (`talk about' is a less formal alternative for `discussion of')

sibilate (verb)	talk (verb)
make a sharp hissing sound, as if to show disapproval	express in speech
express or utter with a hiss	exchange thoughts; talk with
utter a sibilant	reveal information
pronounce with an initial sibilant	use language
	deliver a lecture or talk
	divulge confidential information or secrets