Population rhymes with:
overpopulation, overpopulation, manipulation, overpopulation, stipulation, accumulation, articulation, calculation, coagulation, confabulation, deregulation, emulation, formulation, granulation, innoculation, inoculation, manipulation, miscalculation, overpopulation, overregulation, ovulation, recalculation, regulation, reregulation, simulation, speculation, stimulation, stipulation, strangulation, tabulation, tribulation
Population sounds like:
paladin, paladino, palatine, paldon, palladino, palladium, pallidotomy, palton, pelton, piltdown, platen, platinum, platona, platoon, platten, plowden, plutonian, plutonium, politano, pollution, poppleton, poulton