Populations rhymes with:
manipulations, stipulations, accumulations, calculations, circulations, inoculations, manipulations, miscalculations, ovulations, regulations, speculations, stipulations, strangulations, tabulations, tribulations
Populations sounds like:
paulding, pelting, piloting, plaiting, plateauing, plating, platinum's, platonic, platoons, plaything, playthings, pleading, pleadings, plodding, plotnick, plotting, plutonic, politeness, polluting, populating