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.
siennas sennas sunnas scenas sins zinnias sunnahs sinus snaws sense sinhs sunns sensa sines sains scions seines scenes saunas sanies xenias sinews sensei science sonnies sinuous sons sans suns sones sanes cense since snows sonsy hysons seance snazzy sonsie zanies sanious sawneys senecio
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