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.
kiaughs kaphs kivas coughs quaighs kafs kifs kvas caphs kaifs kavas kiefs kophs kufis kvass kavass
laughs kiaughs saughs ughs aghas vughs coughs quaighs laighs loughs roughs soughs sughs toughs