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.
ballista ballistae ballast bulliest blast blest blasty bluest blastie blissed
ballista list hilliest holiest holist jolliest jowliest lowliest heliast niellist paliest realist pollist celesta sciolist sliest delist diallist duelist wiliest woolliest chilliest shelliest roiliest vealiest violist poloist fliest eeliest bulliest ballistae alist coaliest phallist mealiest oiliest palliest relist ruliest cellist silliest soloist dialist dualist duellist wooliest chiliast shaliest shoaliest
ballies bailies balls ballsy bellies bialies bialis billies bullies