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.
queasiest queaziest gassiest casuist cosiest coassist gauziest goosiest coziest
easiest queasiest busiest bossiest bassist basest assist queaziest fascist messiest massiest mousiest newsiest nosiest pussiest rosiest sissiest cheesiest laziest haziest siesta maziest casuist coassist cosiest gassiest goosiest fussiest hissiest lousiest laciest mossiest mussiest noisiest paciest raciest sassiest wussiest choosiest