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.
poorest prest presto purest preset priest porosity prost purist prosit preside pursuit pressed prostie presidio presidia praesidia periostea prosciutti prosed prised prized priced pursed parsed perused pierced praised precede prissed proceed prosody pursued
poorest forest sorest rest leeriest queerest crest burriest barest priest firriest arrest fairest aeriest freest hoariest aorist prest horste merriest searest mooriest fieriest beeriest hairiest sourest dearest dourest driest teariest wariest wiriest worst charriest sheerest veriest merest eeriest miriest goriest furriest nearest corset rarest horst resit reset wrest wriest airest resat breast reest leariest preset drest cheeriest chariest worset weariest truest tarriest direst airiest surest sorriest serest rearrest purest presto yarest