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.
sensei sense sansei senecio sensa cense seance scenes sonsie scenas sennas science siennas sans suns sins sons sunns sinus sines snaws sonsy sones sains snows zeins sinhs sanes xenias saunas sanies sneeze sunnas sneezy scions hysons seines sinews sanious sawneys sinuous sonnies sunnahs
sansei sensei tense dense venose pensee mense manse lionise linsey lense lanose kinase guanase ionise hanse nisei rinse bonsai ansae anise nose mannose mensae nonuse rennase cense sense ensue nisi sonsie donsie unsew
sen scena scene seen seine sene senna sewn sienna season seisin session