Czechoslovaks rhymes with:
kovach's, davox, kovach's, magnavox, volvox, arnox, bangkok's, benlox, bowersox, clorox, davox, hancox, heacox, hecox, hickcox, hickox, hiscox, isaacks, jacox, kovach's, maalox, magnavox, murdoch's, murdock's, murdocks, reebok's, reeboks, shoebox, silcox, volvox, wilcox, xerox
Czechoslovaks sounds like:
calabasas, calbos, calebs, calf's, callebs, calliopes, calpis, calves, calypso, calypsos, celebs, celibacy, chalifoux, chaloupka, chlebowski, clabaugh, clabough, claps, claybaugh, cleavage, cleaves, cliff's, cliffs, cliffs', clips, cloves, clovis, club's, clubhouse, clubhouses, clubs, colbaugh, colbeck, colby's, colbys, collapse, collapses, coolbaugh, culvahouse, cyclops, cyclops's, czechoslovak, czechoslovakia, czechoslovakia's