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.
screwy screw scarey scry scare sucre scree scary score scarry scurry secure scoriae scar scaur scour sacra sacker sicker skerry soucar sowcar square squire sucker scoria sugary cicoree suckier
screwy crew grew grey regrew scarey screw