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.
scrape scrapie scrap scrappy scarp scrip scroop cecropia
crape grape scrape crap crepe cripe grapey grapy gripe grope backwrap scrap scrapie
sacra score escar scare scarey scarry scary scaur scar scoriae scoria scree screw screwy scry scurry sucre escrow