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.
sprite sprit spirit sprat spurt sport spirt separate superette spored suppurate spared spread sprout spired sparid sporty speered sparoid support sporoid spiered spurred speared spoored spiroid speired seaport supered sparred superadd zippered
pyrite yperite cuprite sprite typewrite periti typewrote cooperate depurate biopirate departee spirit pirate pried repartee pride reoperate parried operate separate sprit perdie purity suppurate prate deportee pardie parity uprate
spar spiry aspire spurry spur spry sprue spree spray spore spirea spare spire spiraea spier speir sparry sparrow spurrey supra osprey