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.
donas donnas dons downs donsy donsie donees dens duns donnees duennas dans dins tons tonneaus dinos dense tonus dunes tunas toons dynes denes dines dawns deans tones towns denies tauons tonnes tineas tenias dienes danios taenias dueness townees townies dunness toonies deionize dinghies tans tens tins tuns
monas nonas donas ons bones foins snaws loins conns coins faunas vinas paeons phons kinas eons onus faenas goannas bunas mynas fohns koans boons nanas sons muons lunas zones ruanas guanays scenas pinnas aeons poons ions kanas neons nouns hyenas chinas johns whenas unais rennase towns tonus peons tones tenias lions taenias downs dons nones hennas hysons sennas hones pones mons phones hyponeas minas onos bonus conus xenias sunnahs manias genoas goons pons nans cons noons annas moans anoas jones manas veenas peones gnaws fons loans gowns phonos moons lanais lianas quinoas cones guineas joins anas nays naos hons leones kinase guanase quoins mannas ones loons roans coons saunas cions kaons scions owns sones pions monos punas knowns hyponoias zinnias mynahs donnas cannas sunnas pinas hyaenas wons zoons unaus tunas toons donsy tons sonsy tineas tauons siennas duennas yonis
dona don done donee donna donne donnee down downy udon