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.
scour score scaur scurry soucar scoria secure scoriae scar scry scary scare sugar sacra screw sucre scree sowcar sacker sucker squire square soaker sicker screwy scarry scarey sugary cicoree soggier suckier
scour cur cor decury coir core cory cure curr vigour mucor rigour scaur score secure decor recur chicory