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.
padre padri padder pater pedro patter powder peatier powdery
cadre madre padre chadar deader redrew radar tarre dire dree dere drew dare quatre kneader dore chadri hydrae adore dearie fader chador wader lader stare header reader padri loader dure beader nadir moidore leader tare shader
pad paddy padi paid payday spade spado