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