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.
reattach reteach rattish retouch ruttish radish
attach reattach tach tache teach attache reteach soutache stitch detach
ratty reata bratty fretty create great pretty treat treaty rat ret