Imprisonment rhymes with:
abandonment, apportionment, disillusionment, enlightenment, environment, reapportionment, abandonment, adjournment, adornment, alignment, apportionment, arraignment, assignment, atonement, attainment, confinement, consignment, containment, discernment, disillusionment, enlightenment, entertainment, environment, infotainment, internment, misgovernment, nongovernment, postponement, realignment, reapportionment, reassignment, refinement, self-government
Imprisonment sounds like:
impersonate, impersonated, impoverishment, impregnate, impregnated, impressment, imprisoned, infrequent