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.
sennas siennas sunnas scenas sunnahs sense sunns snaws sensa scenes xenias sensei saunas seines zinnias sonnies sans sins sons suns snows sinhs sains sones sonsy sinus sines sanes sinews snazzy sanies scions hysons seance sanious sawneys science senecio sinuous
annas cannas sennas duennas donnas mannas siennas sunnas hennas goannas pinnas pinas snaws bunns kinase punas guineas bennis bunas kanas kinas faunas lunas tineas bennes tenias mynas jinns naos hyaenas whenas unais rennase tonnes vinas scenas ruanas zinnias pannes nans pennis anas nays anoas manas mynahs wynns sunns gnaws taenias faenas guanays veenas conns jinnis genoas guanase minas quinoas joannes sunnahs nuns tennis lanais monas bonnes saunas inns lianas nanas nonas hyponeas xenias donas banns linns tunas manias unaus chinas hyenas
senna sen scena scene seen seine sene sewn sienna sonny sunn sunna sunnah sunny