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.
purrs purs pours puris parrs purse pursy pursue purees pars parries pros perries pyres prays praos prase perse piers press presa pairs priss paras prows prise proas pores prese prose peris pears proso preys prees pares pyros peers peres praus parse paris prosy pross pries porous prissy pareus porose parous pooris paries pareos praise hypers peruse pariahs peeress peeries prossie prez
burrs durrs currs murrs churrs purrs burs houris buhrs sierras orris purse ours furs suers myrrhs morros bursa sours gnarrs errs murres knurs knaurs feuars sieurs lures bourse course yirrs sherris churros chirres charros urus tours terras burse kurus ruers mures duras nurse dorrs duros surras kauris pours parrs buras sirras guars purs dures cirrus hours tarres burros cures aures carrs kouros durras gharris fours gaurs euros birrs auras pursy lours arras morris lauras gurus derris suras douras auris curs puris arris barres curse muras chirrs torrs ursa queuers whirrs charrs murras giaours shirrs yours
purr pur parr parry perry pour pure puree puri spur spurrey spurry