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.
capos caps capes capias coypous gaps cops cups copious copse gawps coups copes capiz gapes coops kapas copays copies coupes coypus cuppas kappas cowpeas cowpies keps kips kops
apos cheapos capos apps reoppose hypos epos haps heaps soaps baps maps chapes gaps kapas laps leaps naps napas coypous zaps yaups shapes oppose pappose paps pops raps repose tepoys whaps apes apse depose tapes taps hippos hoopoos saps typos gawps sepoys jaups capes napes teapoys japes poos daps lupous rapes knaps hoopoes appose caps pose pows lapse posy tapis gapes wraps neaps repos topos tapas pappous suppose waps papas pois reaps chaps pepos lapis cheaps yaps whaups yawps