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.
scarry scary scurry scarey scry scar scare scaur soucar sugary screwy skerry sowcar skirr saker sugar screw scree sacra sucre score scour cigar soaker sagger square scoria saggar sicker seggar secure sucker sacker saggier saguaro scoriae suckier
quarry scarry carry recarry beggary skerry carr curry gurry kaury kerry equerry jaggary scarey scary scurry vagary sugary