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.
kops koppas cops keps kips koppies keeps kepis kapas copes coups goops coops copse copays coupes kappas coypus copies coypous kewpies cowpies cowpeas copious caps cups gaps capes capos gapes gawps quips
bops lops chops woops whoops sops pops poops ops oops knops mops loops fops kops goops cops coops hops hoops hyssops tops whops wops shops