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.
shirk chirk shark shriek shrike shrieky chark shrug charka
shirk chirk irk birk hark kirk quirk quirky mirk mirky dirk chark shark
shirr shire chiro chirr chirre chiru share sharia shariah sherry shier shore shrew shri ashier