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.
voudons voudouns vodouns voduns voidness futons photons voidance fadeins phytons
voudons udons dons putons futons mutons lowdowns guidons godowns codons hoedowns voudouns vodouns boutons tauons boudins downs donsy donas loudens moutons odeons radons soudans adonis redons showdowns