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.
parson person prison persona parazoan personae preassign porcine porcini porcino
parson arson person orison whoreson grison treason sarsen prison persona coarsen garrison hoarsen frisson boursin resown reason warison worsen
parse pars pareus pares pareos paras pairs presa press pariahs pros proso prossie purs pursue spares spars priss paries paris prissy parries parrs pears perse prase prese prise parous prose pross prosy purse pursy sparrows sparse