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.
roto rot root riot rota rout rote rood roti rato rotte wrote rodeo rooty route roadeo ret rod rut rat redo rete rite road writ rode rate ratty rutty raita rhyta reata retie radio riata write rowdy