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.
prison parson person persona personae porcine porcini porcino parazoan preassign
garrison warison prison grison orison arisen greisen rerisen raisin reason resown risen person frisson horizon persona arson coercion treason parson whoreson
prise priss prissy pursy purse puris prossie proso pros presa paries prase paris pars parse peris praise perse pricy prize pries prose pariahs pross prese prosy press purs price pursue pricey uprise