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.
quark quirk quirky cark carack carrack karaoke cork grok kirk
quark ark charka wark tarok dark sark park nark murk marka mark lurk larky lark quirk cark hark burke burka barky bark arak murky narky parka sarky darky turk chark shark
quare quarry guar quaere query quire aquaria quackery quackier quaggier quaker quakier square