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.
diorama drama diram dorm dram derma dormy dream trauma dormie tarama dreamy derm drum tram durum tryma dayroom teraohm
diorama brahma foram joram caramba grama gramma korma drama tarama trauma ram