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.
shrug shark shirk shriek shrike charqui shrieky
shrug rug ruga aerugo erugo frug drug trug
share sharia shariah sherry shire shirr shore shrew shri shusher