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.
periostea prostie prost prosit purist prosed prised priest perused prissed parasite persuade porosity prest prussiate priced prized preset presto purest prosciutti prosciutto pierced peracid poorest pressed prosody preside pursuit presidia presidio hyperacid parricide praesidia