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.
taps tapis tapes tapas taupes tips tups daps tops tawpies teapoys topes topos typos tipis tepas types typps tipsy topis topees tepees tepoys toupees teepees dips dups diapause deeps dipso dopas dopes dupes topaz
baps naps cheaps whaps taps zaps saps wraps reaps raps paps neaps knaps haps maps leaps laps gaps caps heaps soaps daps waps chaps yaps