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.
score scoriae screw sucre scree scare scour scarey secure scoria screwy scar scry cicoree scaur scary sacra scarry scurry sicker soaker soucar sowcar square squire sucker sacker soggier suckier
score core cor decree decare sucre screw scour cicoree cure scare ogre care coir cory crew gore mucor nacre kore ocrea scree acre secure agorae daycare fiacre decor lucre chicory