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.
nitril nitrile notarial notarially nadiral natural neutral naturally neutrally
nitril trial retral poitrel peytral petrel triol notarial drill mitral drily tearily tirl trail tawdrily dietarily tutorial citral drail derail materiel redrill peytrel petrol patrol neutral nitrile material laetrile trill vitriol bedrail atrial dottrel sterile tetryl retrial waterily
nitre nitro knitter niter niterie nitery nittier nutria antra antre entree entry intro unitary uniter untrue