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.
donsie dons dense downs donas donsy deionize donnas denies donees townies donnees toonies dens duns dans dins tons dinghies dinos dawns deans dunes towns dance tones tense denes dines dynes tonus toons dunce danios dienes tauons tonnes dueness duennas dunness tawnies tennies townees tunnies tonneaus
sonsie donsie ionise boonies ponies phonies gunnies lanose goonies johnnies mense nice funnies genies heinies pennies ninnies peonies zanies lunies monies venose sheenies sanies wienies weenies bunnies tunnies toonies tennies denies sense ensue newsie sonnies rinse fannies linsey meinies ionize manse kinase hinnies conies jennies nannies minnies bennies dense mensae deionize meanies pinnies lionize loonies nonuse nisi pensee beanies guanase lense anise bonsai sensei mannose ansae lionise cense hanse tawnies rennase tense townies sansei unsew whinnies nose shannies shinnies
don dona done donee donna donne donnee down downy udon