Fraternize rhymes with:
westernize, ironize, modernize, westernize, africanize, agonize, aluminize, americanize, antagonize, balkanize, canonize, carbonize, christianize, colonize, communize, demonize, disorganize, euthanize, galvanize, harmonize, hellenize, homogenize, humanize, immunize, ionize, ironize, lionize, mechanize, misrecognize, modernize, organize, patronize, recognize, reorganize, revolutionize, scrutinize, stalinize, suburbanize, synchronize, unionize, urbanize, westernize, womanize
Fraternize sounds like:
frittering, furtherance, furthering