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.
rowdy rod rood road rode rodeo ruddy reedy ready rooty roadie roadeo red rot rad rid rude rato rudd root roti rote rota ride roto rede reed redo read riot raid redd rout rued
howdy rowdy dowdy soddy shadowy noddy wady moody toddy meadowy toady doody goody gowd hoody boody body bawdy towy today tody woody shoddy
row brow frow vrow crow grow prow trow