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.
keps kepis keeps kops kips kewpies kapas koppas kappas koppies cops cups caps gaps coups gapes gawps goops capos coops capes copes copse quips
beeps ceps cheeps wheeps weeps deeps zeps seeps reps veeps peps peeps neeps keps keeps jeeps yeps