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.
dollop dewlap
gallop dollop lollop shallop collop wallop lop lollopy loop slope bloop sloop elope pullup fillip galop flop loup jalop plop jalopy saloop clop slop lope glop
dolly doll dol doolie toll doolee dull dole doyley doula dooly diol doily dilly dill delly dell dally doyly dully idol