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.
padri padre padder pater pedro patter powder peatier powdery
padri chadri dearie reader radar padre nadir kneader madre leader loader lader deader header fader beader hydria sudaria wader chador cadre chadar shader
pad paddy padi paid payday spade spado