Harmonize rhymes with:
aluminize, demonize, humanize, womanize, africanize, agonize, aluminize, americanize, antagonize, balkanize, canonize, carbonize, christianize, colonize, communize, demonize, disorganize, euthanize, galvanize, hellenize, homogenize, humanize, ionize, lionize, mechanize, organize, patronize, reorganize, revolutionize, scrutinize, suburbanize, synchronize, unionize, urbanize, womanize
Harmonize sounds like:
haering, hairiness, harangue, harangues, haring, harm's, harmening, harmes, harming, harmon's, harmonic, harmonica, harmonics, harmonies, harmonious, harmonizes, harms, harnack, harnage, harness, harnesses, harnisch, harnish, harnois, harring, harrowing, hearing, hearing's, hearings, hearns, heironimus, hering, herman's, hermance, hermanns, hermans, hermes, hermias, hermosa, herms, heroin's, heroines, heron's, herons, herring, herrings, herringshaw, herronimo's, heuring, hiring, hirings, hiromasa, hirons, hormones, hormuz, horn's, hornack, hornak, hornick, hornig, hornik, horning, horns, hornung, hornyak, hronek, hurrying