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.
chitons chitins chitinous chutnees chutneys shaitans sheitans chattiness shadiness showdowns shoddiness
nitons pitons chitons tons cottons setons cytons rattoons ratoons tones tonus newtons boutons phytons towns atones ketones duotones whitens chitins shaitans toons batons mutons futons stones seitans photons rhytons phaetons muttons rattons putons buttons witans betons guidons jettons jetons titans moutons sheitans