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.
tawdry datary dietary tatar tater tidier tedder tauter tatter deader doddery dowdier tattier tottery tuatara tuatera tattooer
bawdry tawdry dry chowder lewder doddery sudary cedary rudery redry powder powdery feudary feodary dray dowry dory cheddary gaudery shuddery
tad toad toady stade stadia toadied