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.
rid raid ride wried red rad rod read road rued writ riot rood redd rode rite rude rede reed roti rudd redo rowdy redia raita ready ruddy rodeo radio retie readd reedy riata radii write rediae roadeo roadie