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.
coattail cattail cattalo cattily catalo cattle coital coitally caudal cuttle cuittle goutily caudally caudillo caudle coddle cutely guttle kettle kittel kittle
coattail cattail rattail tail wittily tattily fattily cattalo cattily knottily nattily nuttily ruttily detail dottily pettily total retail chattily til
coat cattie catty coatee coati cotta cottae coact scatt scatty scottie cat cot