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.
gneiss ness gnus news nisi noes gnaws knees newsy nisei noise noisy newsie nos nus
gneiss ess wiss sissy seis cess piss ness miss jess missy messy fesse hiss hissy gesso fess mess cuisse guess kiss kissy leis less loess jesse peise reis cissy seise diss chess
gene genie genii gane gone gonia