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.
spoored spored spread spared spired speired speered spiered supered sporoid sparred speared spurred sport sporty sparid sprite seaport spiroid sparoid support zippered superadd separate superette spirt spurt sprit sprat suppurate superroad spirit sprout
spoored pored poured vapored vapoured repoured spored