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.
shelliest shaliest chilliest shoaliest chillest shoalest chiliast chaliced
hilliest jolliest silliest shelliest bulliest woolliest chilliest palliest paliest dullest jowliest coaliest illest diallist pollist oiliest mealiest tallest niellist lowliest vealiest holiest shaliest wiliest ruliest chillest duellist sliest roiliest phallist ballista cellist eeliest fellest fliest gluiest wooliest fullest shoaliest lest list