Manipulation rhymes with:
stipulation, overpopulation, population, stipulation, accumulation, articulation, calculation, coagulation, confabulation, deregulation, emulation, formulation, granulation, innoculation, inoculation, miscalculation, overpopulation, overregulation, ovulation, population, recalculation, regulation, reregulation, simulation, speculation, stimulation, stipulation, strangulation, tabulation, tribulation