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.
sparred spared spurred speared spored spread spired sparid spoored spiered supered speired speered sparoid separate superroad sprite spiroid sporoid superadd zippered spirt sprat sprit spurt sport superette suppurate spirit sporty sprout seaport support
sparred parred paired pared parried purred appeared coappeared reappeared repaired spared speared spurred
sparrow sparry spar spare spear spurrey spurry