Soapbox rhymes with:
boombox, breadbox, fischbach's, gearbox, icebox, jukebox, mailbox, matchbox, saltbox, sandbox, skybox, tarbox, tinderbox
Soapbox sounds like:
saab's, sab's, sabas, sabbagh, safeco, safehouse, safes, safeway's, safko, saps, sauvage, sauvageau, savage, savages, savaiko, savas, save's, saves, savich, savickas, savikas, savko, savoca, scabs, scavuzzo, schabes, schepis, schiavo's, schipke, schoepke, schubach, schupak, schupbach, schwab's, schwebach, schwebke, schweppes, scoffs, scoops, scopes, scopic, seabaugh, seabeach, seabees, sebaceous, sebek, seebach, seebeck, seepage, seeps, sefcik, sepich, sepik, sepsis, sevcik, sevick, sfuzzi, shabazz, shabazz's, shakeups, shapes, shaves, sheaves, shebek, sheep's, sheepish, sheeps, ship's, shipes, shipp's, shipps, ships, ships', shipwash, shives, shockwaves, shoebox, shop's, shopko, shoppes, shops, shoves, showbiz, showbuzz, showpiece, sieves, sifco, sigafoos, sipes, sipos, sips, sivak, skibicki, skiffs, skipjack, skipjack's, skipjacks, skippa's, skips, skopje, skufca, skybox, skyboxes, soaps, sobczak, sobczyk, sobeck, sobecki, sobek, sobiech, sobieski, sobkowiak, sobs, sofas, sofia's, sophie's, sopko, sops, soup's, soups, space, spacek, spaces, spacey, spacious, spack, spago, spak, spake, spas, spasso, spaugh, speak, speake, speakes, speakes's, speaks, speas, spease, spec, species, species', specious, speck, specks, specs, speece, speech, speeches, spees, speich, spevak, spews, spic, spice, spices, spicey, spicuzza, spicy, spies, spiess, spiewak, spike, spikes, spiky, spisak, spivack, spivak, spiwak, spock, spoke, spokes, spoofs, spook, spooks, spooky, spouse, spouse's, spouses, spy's, squibb's, sub's, subic, subs, subs's, subways, suffice, suffices, suffix, suffuse, suffuses, supak, suppes, suppose, supposes, suspicious, svec, swabs, swapes, swapo's, swaps, sweeps, swipes, swoops, swopes, sybase, sybase's