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.
pieta pita pitta piety pit pet peat poet pied pity podia petty petto petti peaty pattie puttie pot put pad ped pat padi paid pate paty peed pout ptui putt
pieta eta cheetah chaeta diet setae riata raita pita idea moiety meta litai quiet gaiety geta beta iota vitta vitae vita feta biota betta piety pitta reata seta zeta dita chaetae chetah