assibilation vs assibilate

assibilation is a noun but assibilate is not a noun.

Word	Noun	Adjective	Verb	Adverb
assibilation	Yes	No	No	No
assibilate	No	No	Yes	No

assibilation (noun)	assibilate (noun)
pronunciation with a sibilant (hissing or whistling) sound
the development of a consonant phoneme into a sibilant

assibilation (verb)	assibilate (verb)
	change into a sibilant
	insert a sibilant sound before or after (another sound)