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.
datary dietary tatar dater tawdry datura tuatara daughter tater deter doter dieter detour dotier dotter deodar deader tauter tatter deodara doddery dottier tattier tottery tuatera tattooer
votary dietary datary rotary notary tar try guitar tare tatar battery buttery taro zedoary littery story jittery starry cottar tuatara cautery teary eatery poetry retear bootery satara stair stroy feudary trey chattery mattery wheatear diary ottar tarry stray stare attar guttery betray troy tory sudary feodary tahr tottery watery deary tray tear pottery retry cedary sitar star nitery lottery dairy cattery cheddary
data dada date dato datto daut dautie dawt dawtie dita doat dated dauted dawted doated