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.
saucer saucier sassier sizer sizar sizier cesura cicero seiser seizor seizer seisor cesurae scissor seisure seizure sissier suasory scissure
saucer cere ricer racier piecer nicer pacier macer lacier lacer mouser causer juicier douceur dicer user saucier choicer cicero juicer icier muser issuer rouser reissuer racer pacer pauser suer facer cero viscera voicer houser douser dicier chicer deicer chouser
sauce saucy sauces saice fauces saices