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.
shark chark shirk charka shriek shrike shrieky chirk shrug charqui
hark shark chark ark tarok cark quark wark darky sarky arak bark barky lark nark larky narky park parka sark mark dark chirk marka charka shirk
share sharia shariah char chare charr charro charry chary shear sherry shire shirr shore shrew shri