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.
triton tritone tortoni tartan tartana trodden turdine teardown torten drawdown
triton carton burton puritan parton gueridon crouton croton craton cartoon ferritin ratton ratoon barytone baryton baritone rhyton rattoon proton tortoni tritone
trite tret stride tarty tort torta torte trait tart tried triad triode trot reiterate ritard striata striate tittered