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.
soucar sowcar scar scaur scare sugar scary scour sucre scarey square sugary scarry sucker soaker suckier saguaro scry scree sacra cigar screw score saker sacker scurry seggar sicker squire screwy secure saggar scoria sagger saggier scoriae soggier
soucar car decare sugar square jaguar saguaro picaro picara mucro mucor lucre cougar scar care acari quare guar carr scare scaur vicar scary sowcar sucre daycare chukar
soca sock socko souk suck sucky