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.
trimmer trimer termer drummer dormer tremor dreamer dreamier termor
rimmer krimmer primmer trimmer grimmer brimmer crimmer grimier trimer rammier crummier primero rummer lorimer rammer crammer rimer firmer primer rimier drummer rummier grummer