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.
quaigh cough quaff quiff kiaugh
laigh quaigh agha faugh high gighe kiaugh laugh neigh nigh saugh sigh waugh weigh
quai qua quay aqua aquae guaiac quack quacky quag quagga quaggy quake quaky quick quickie squaw