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.
cogs gogos cooks cocos cokes cocks cocas guacos cocoas cacaos cox cuckoos cookeys cookies coax kegs coxa gags cakes cocci coxae cukes gawks gooks gowks cacas gucks kagus kecks kicks kooks quags
biogs bogs fogs hogs jogs cogs logs mogs nogs dogs togs wogs shogs