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.
scrip scarp scrap scrape scroop scrapie scrappy cecropia
scrip carp crap cripe crop grip gripe gripy scarp scrap
sacra scar scare scarey scarry scary score scoria scoriae scree screw screwy scry scurry sucre escrow