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.
squirt squired skirt squawroot squared skirret security scart skort secret scrota secured sugared skirred scoured secrete cigaret zikurat scurried skywrite skywrote suckered ziggurat zikkurat
squirt quirt court curet curt kurta quart recruit skirt ziggurat zikkurat zikurat yogurt