Advertise, catechise, chastise, criticise, exercise, exorcise, and merchandise, are most commonly written with s and size, assize, capsize, analyze, overprize, detonize, and recognize, with z.

"Legalize, equalise, methodise, sluggardize, womanise, humanize, patronise, cantonize, gluttonise, epitomise, anatomize, phlebotomise, sanctuarise, characterize, synonymise, recognise, detonize, colonise.

"Legalize, equalize, methodize, sluggardize, womanize, humanize, patronize, cantonize, gluttonize, epitomize, anatomize, phlebotomize, sanctuarize, characterize, synonymize, recognize, detonize, colonize.