Colonizer rhymes with:
demonizer, ionizer, organizer, womanizer, demonizer, ionizer, ironizer, organizer, womanizer, advertiser, agrivisor, analyzer, anheuser, appetizer, atomizer, cafetizer, compromiser, demonizer, energizer, equalizer, evilsizer, evilsizor, exerciser, fertilizer, franchiser, hulsizer, ionizer, ironizer, itemizer, lighthizer, merchandiser, mobilizer, moisturizer, nebulizer, organizer, oxidizer, plasticizer, polarizer, popularizer, rittereiser, stabilizer, sterilizer, supervisor, sympathizer, synthesizer, tranquilizer, wickizer, womanizer
Colonizer sounds like:
challenger, challengery, cleanser, clencher, clincher, clinger, cloninger, clunker