I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
soulless soilless sullies soles souls sailless selles soleus sols sillies sallies sulus sauls sills slews solus solos sales soils sloes sells slues solace scillas sallows sels sals cells sylis slaws slays slice sails slows sulci seals silos salsa seels zills cellos selahs sleaze sleazo sleazy sluice
heelless wheelless toolless soilless sailless coalless mailless tailless soulless keelless mealless goalless less loess jollies halloes filles callees gullies galleass ghillies vowless bullies collies holloes folles boughless hollies hulloes helloes gallies bowless gulleys hilloes keyless sullies chillies woollies failles wayless tulles toyless toeless tellies ballies dollies dewless lollies dallies selles galleys fellies valleys billies awless belles mallees rallies milles viewless lawless pollees pulleys felloes allees hueless alleys boulles jawless fillies tailles rilles jellies rayless bless cullies gillies bellies volleys feeless mollies allies dellies nellies joyless malleus rouilles killies sallies mulleys dalles follies dillies sillies tallies tieless kellies tuilles wallies wellies willies challies shoeless les