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.
ret rete retie reata rat rut rot red rued rede read riot rate rode rude roto rote rout reed redd rato ride writ redo root roti rota rite reedy write wried rhyta ready raita readd riata ratty rooty route rutty rodeo rotte redia wrote rediae roadeo roadie