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.
heaps haps hips hops hoops hopes hippos hippies hoopoes hoopoos huppahs
heaps leaps cheaps reaps neaps caps whaps tapes cheapos chapes pepos repos reps knaps waps gapes apps deeps saps taps zeps neeps epos veeps peps yawps yaps baps cheeps keeps appease papas cepes peeps gawps napes apse wheeps beeps keps pease lapis soaps jaups repps rapes chapeaus capes haps zaps ceps lapse tepas seeps whaups kepis weeps tapas wraps daps apos apes paps laps jeeps capos cowpeas gaps kapas chaps maps tapis napas naps japes peas raps shapes yaups yeps