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.
garden gardenia guardian gradin cardon cardoon guerdon greaten gradine grutten gueridon carotene gratin carton cordon cretin carotin cartoon gratine quartan carrotin cartoony cretonne gratinee
burden harden garden warden hordein chorten torten cordon trodden joyridden pardon jordan lurdan hearten cardon guerdon broaden bourdon ridden redeny redden lardon verdin marten shorten
garda gardai grody card cardia cardiae cardio garote garotte garret garred garrote garrotte grad grade grid gride guard