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.
cougars cockers cookers gaggers gawkers quakers cookeries kukris keggers kickers
cougars sugars gars beggars jaguars squares gaurs guars agars augurs hegaris eggars muggars cigars saggars saguaros seggars soucars chukars