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.
racist raciest resist rosiest recessed
cist fascist racist cheesiest dizziest wheeziest sissiest desist resist sassiest fizziest laciest assist queaziest foziest fussiest fuzziest hissiest wooziest choicest jazziest casuist cosiest easiest goosiest lousiest maziest mossiest mussiest newsiest noisiest oocyst paciest raciest busiest gassiest zooiest mousiest iciest muzziest gauziest queasiest coassist juiciest laziest bassist cecity cyst booziest massiest hylozoist nicest messiest haziest nosiest ooziest pussiest coziest basicity bossiest rosiest sauciest siziest diciest doziest whizziest wussiest chicest choosiest
races raises araceous braces braises braizes fraises graces gracioso gracious praises traces