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.
dull dully dually duello duelli doll dual dill duel dell duly dilly dulia tulle dally delly dolly doula tuille dal del dol tule toll dial dole dahl diol diel deli dale tall deil tell deal dele till daily delay doily dooly doyly tally telly
bull full hull cull gull lull mull null pull dull