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.
scarey scary scare screwy scarry scry scar screw scree sucre scaur score secure sowcar sugary scurry square soucar scoriae sugar sacra cigar saker scour sagger saggar sucker squire sacker seggar soaker skerry sicker scoria cicoree saggier saguaro suckier
scarey care chickaree decare sugary screwy scarry scare puggaree grey kaury quaere quare quarry carry eagre beggary fiacre vagary jaggary meagre nacre pugaree recarry acre scary square daycare dekare shikaree