illegalize vs illegalise

illegalize and illegalise both are verbs.

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

As verbs, illegalize and illegalise are synonyms defined as:

Other synonyms of illegalize include criminalise, criminalize, outlaw.

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