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