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.
protease proteas proteose proteus proettes prates pirates parrots pirouettes pyrites parties protozoa pierrots parietes yperites parities purities parodies paradise pretties ports prods prats parts purdas prudes prides parodos purdahs parados periods parades pardahs perdues produce peritus pyritous priedieus pards perdus