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.
cups coups coupes cuppas caps cops copes coops quips capes copse capos capias quipus copies coypus copays cowpeas copious quippus coypous guppies cowpies keps kips gaps kops capiz gapes gawps goops kapas keeps kepis
jaups coups cups loups pups roups soups sups dups tups ups whaups whups yaups yups