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.
scry scary scarey scurry scarry screwy scar sucre sacra score screw scour scree scaur scare secure sowcar sacker sucker scoria sicker skerry soucar sugary scoriae suckier cigar saker siker skier skirr sugar