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.
shriek shrieky shrike shark shirk chark chirk shrug charka choric charqui choreic
shriek reck shrieky trike trek drek derrick prick crick creek creak hayrick phreak freak brick reek break birkie wrick wreck wreak rick greek darkie dreck traik trick eureka shrike
shri share sharia shariah sherry shier shire shirr shore shrew ashier