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.
neutral neutrally natural notarial naturally nitril notarially nadiral nitrile
neutral lateral citral retral petrale natural mitral littoral litoral literal guttural dural futural butyral atrial trial trawl trail peytral retrial sutural