Planks rhymes with:
blanks, flanks, bank's, bankes, banks, banks', blanks, brank's, branks, commerzbank's, cranks, danks, flanks, franc's, francs, frank's, franks, hankes, hanks, manx, pranks, ranks, sanks, shanks, tank's, tanks, thank's, thanks, yanks
Planks sounds like:
palance, palansky, palauans, palinkas, palma's, palms, palonius, paulhamus, pauling, pavilions, pawling, peeling, peplinski, phalange, phalanges, phalanx, piling, pilings, pilling, pilnak, pipeline's, pipelines, pipelines', plaines, plains, plan's, planas, planck, plane's, planes, planes', plank, planning, plans, plans', playing, plemmons, plemons, plenum's, plinius, plink, plonka, plonski, plowing, plowman's, plum's, plumage, plumages, plumes, plums, plunge, plunges, plunk, plying, polanco, polanski, polansky, polemic, polemics, polhamus, polhemus, poling, polinski, polinsky, pollens, polling, pollyannish, polonaise, polonsky, polynesia, pooling, poulenc, poulenc's, pulling, pullins, pullman's, pylons