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.
lapis laps lapse leaps lips lops loops lopes loups lupus lipase loupes lupous
lapis tapis pis waps spies copies kapas maps kewpies capias gapes piss tapes pois pies jaups gawps paisa hippies piso paise sepias capos daps chappies yippies yaups whaps shapes cheaps nappies cheapies whoopies pias pips raps napas wraps pappies neaps taps puppies tipis lapse apos yaps gaps baps weepies koppies capiz cheapos guppies chapes buppies capes laps japes cowpies leaps poppies heaps tawpies haps apse paps rapes caps tapas zaps soaps saps reaps apps apes papas yawps naps napes kepis knaps topis whaups chaps chippies yuppies
lap leap flap flappy clap slap