Containment rhymes with:
attainment, entertainment, infotainment, arraignment, attainment, entertainment, infotainment, abandonment, adjournment, adornment, alignment, apportionment, arraignment, assignment, atonement, attainment, confinement, consignment, discernment, disillusionment, enlightenment, entertainment, environment, imprisonment, infotainment, internment, misgovernment, nongovernment, postponement, realignment, reapportionment, reassignment, refinement, self-government
Containment sounds like:
comandante, commandant, commandment, commitment, condemned, condiment, conditioned, condoned, contained, contaminant, contaminate, contaminated, contant, contend, contended, content, contented, contento, continent, continued, continuity