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.
scary scarry scarey scry scar scare scaur soucar sugary screwy sowcar scurry scour scree sugar saker sacra cigar sucre screw score skerry sacker saggar sucker secure sicker soaker square scoria seggar sagger saggier saguaro scoriae suckier
scary car cry scare decury recarry decare picaro sugary picara soucar jaggary scaur scar vicar scarry vagary care beggary scarey quarry kaury cory carry carr acari scry sowcar daycare decry chicory