Abandonment rhymes with:
apportionment, disillusionment, enlightenment, environment, imprisonment, reapportionment, adjournment, adornment, alignment, apportionment, arraignment, assignment, atonement, attainment, confinement, consignment, containment, discernment, disillusionment, enlightenment, entertainment, environment, imprisonment, infotainment, internment, misgovernment, nongovernment, postponement, realignment, reapportionment, reassignment, refinement, self-government
Abandonment sounds like:
abandoned, abundant, appointment