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.
sciences seances censes senses senseis sinuses census sneezes snoozes synesis senecios sensuous sinicize
faiences sciences fences minces dunces senses jaunces nonces nances nieces fiancees jounces fiances hances rances bounces tenses winceys fancies quinces ounces lances pounces tenaces dances launces seances ponces lenses pinnaces winces censes nuances nancies monoecies menses menaces chances
science scenas scenes scions siennas oscines