illegalise vs illegalize

illegalise and illegalize both are verbs.

Word	Noun	Adjective	Verb	Adverb
illegalise	No	No	Yes	No
illegalize	No	No	Yes	No

As verbs, illegalise and illegalize are synonyms defined as:

Other synonyms of illegalise include criminalise, criminalize, outlaw.

illegalise (verb)	illegalize (verb)
declare illegal; outlaw	declare illegal; outlaw