Here's what rhymes with colonien.
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labium coliseum cerium samarium francium museum mausoleum encomium cilium imperium trapezium solarium protactinium uneven needn neaten didn reason region season lesion beaten demon heathen seamen weaken deacon deepen legion seaman semen beacon reafon renin daemon diesen cheapen phaeton wheaten unbeaten treason adhesion chieftain accretion freeman archdeacon artesian sweeten elision cretin collegian pigpen sequin steepen completion secretion cohesion policeman deletion freedmen freedman repletion preseason overeaten depletion polyhedron fieldsman excretion amphotericin tetrahedron postseason plainclothesman