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.
lapse laps lapis leaps lipase lips lops loops lopes loups lupus loupes lupous
apse lapse paise pose pease pause passe paseo gawps pase japes capes caps gapes apes lipase knaps diapause neaps suppose yaups paps rapes reaps repose saps papas shapes daps tapes taps whaps chapes cheapos napes apos appose naps maps leaps lapis appease laps kapas apps gaps copse capos jaups heaps haps baps napas oppose tapas yaps cheaps chaps whaups waps tapis depose pappose zaps soaps wraps reoppose raps popsie yawps
lap leap flap flappy clap slap