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.
cottons codons cotans cattiness codens cutins coetaneous catenas ketones codeins godowns kittens codeinas codeines cuteness cutinise goodness goutiness guidons ketenes
buttons jettons cottons rattons muttons tons nitons batons lattins toons mittens tonus ratoons pitons lattens atones pattens putons rattans kittens mutons phytons duotones rattens battens photons jetons rhytons moutons fattens ketones boutons towns newtons futons setons betons tones phaetons mattins rattoons cytons stones chitons