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.
newtons nitons neatens neatness neotenies neotenous neediness
newtons tons towns toons tonus cottons moutons muttons mutons batons nitons putons rattons rhytons setons duotones atones betons ketones buttons boutons futons phaetons photons phytons jetons jettons tones pitons ratoons rattoons cytons stones chitons