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.
sowcar soucar scar scary scaur scare soaker scarry scarey scry sucre saker sugar cigar score scour scree sacra sicker scurry saggar sacker sagger secure scoria square sucker seggar sugary saggier saguaro scoriae soggier suckier
sowcar car care carr acari vicar picara picaro scar scare scary scaur soucar daycare decare