Imputation rhymes with:
amputation, computation, amputation, computation, reputation, amputation, commutation, computation, reputation, accreditation, agitation, amputation, annotation, cohabitation, commutation, computation, connotation, dilatation, equitation, facilitation, habitation, hesitation, imitation, inhabitation, meditation, misinterpretation, palpitation, premeditation, prestidigitation, recitation, rehabilitation, reinterpretation, reputation, sanitation, vegetation, visitation
Imputation sounds like:
imboden, inboden, infatuation, inhabitation, inhibition, innovation, invitation