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.
cuckoos cocos kooks cooks gucks cocks cukes cacaos quicks cocoas quacks cookies cookeys cogs quickies cacas gogos cakes cocas gooks cokes kicks kecks caucus guacos quakes caiques quokkas
cuckoos coos shackoes wackos sickos kooks cooks cocos jockos geckos geckoes buckos buckoes bookoos boocoos whackos shackos cos kos