Napco rhymes with:
mapco, ampco, copco, ipco, kepco, kopko, mapco, popko, repko, shopko, sopko, zupko
Napco sounds like:
nabisco, nabisco's, nabobs, nafco, namibia's, naps, navajo, navajos, navas, navickas, navies, navis, navy's, neaves, nephew's, nephews, neves, nevis, nevius, nibs, nieves, nimbus, nips, nipsco, nobec, nobec's, nobis, nobuaki, nobuyuki, noffke, nova's, novacek, novack, novak, novak's, novakowski, novas, novice, novices, novick, novicki, novo's, nymphs