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.
literal literally lateral litoral littoral laterally latterly
literal lateral dotterel sterol citral ruderal retral petrale natural material littoral litoral latterly guttural futural federal butyral bitterly atrial trial trawl trail derail mitral neutral peytral retrial writerly sidereal sutural utterly
liter later litre litter littery loiter alter