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.
peart part pert party periti parity parrot parroty prat yperite pierrot port pard perdu pared purty pardy perdy pardi protea parody period parade perdue pretty pardee parred peered perdie pardie pardah purity parodoi parried peridia proette prod pirouette
heart peart art mart airt cart boart quarto quart karat create beard arty carat beret reata dart tarot tarty treaty warty whereat chert aureate fart vert merit treat wart derat tart quarte kart pert part vertu chart wert party laureate great hart carte caret hereat hearty heard cherty
pear per par parr sparry pere spare peery opera peerie aper peer perry parry pereia pareu pariah pareo pare parae para pair perea peri pier apery spar sparrow spear