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.
duennas donnas duns dens dunness dueness denes tunas dunes deans dense donas denies tennis dienes tenias taenias tunnies donnees tennies tens dins dons dans tuns tonneaus tense dunce dines tunes donsy teens dynes downs dawns dinos tineas teensy tauons danios tonnes tenuis tenues donees tenace tannoys tenuous
hennas sennas duennas siennas pennis hyaenas nonas tennis nanas taenias zinnias goannas donnas xenias sunnahs pinnas annas sunnas rennase veenas faenas bennis bennes scenas cannas mannas genoas tenias whenas hyenas ens