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.
sansei sensei sans sanes sains sense seance sonsie saunas sanies sanious sawneys suns sins sons cense sinus sones sonsy since snows sinhs snaws sines sunns scenas scenes sunnas sneezy hysons seines snooze sinews sneeze scions zanies science senecio siennas 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
sain sane sauna sawn sawney asana sasin season