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.
fellest fullest fliest foulest vealiest vilest falsity felsite felicity phallist villosity volost fleeced violist
fellest dullest illest chillest fullest tallest lest blest mealiest least niellist eeliest palest holiest jolliest wiliest diallist chilliest ruliest silliest celeste palliest paliest teleost wooliest vilest realest shoalest woolliest shelliest hilliest ballast bluest coaliest phallist lowliest vealiest molest bulliest sliest jowliest fliest shaliest pollist roiliest celesta cellist duellist oiliest coolest halest foulest shoaliest
feeless fellahs fellas fellies felloes fellows fells filles folles