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.
drum durum derm dorm dram drama dream dormy derma diram dreamy trauma dormie dayroom diorama trumeau yttrium term tram trim tryma
rum arum aurum ferrum forum jorum grum quorum larum serum drum durum