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.
cottony cotton codon cotan gotten coden cutin catena codein godown ketone kitten catenae codeina codeine
cottony muttony buttony tony stony toney towny atony betony button jetton mutton ratton rattoon stoney cotton dittany ton