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.
parrot parroty part pierrot party peart protei parity parody protea parred parried parodoi proette port pard pert prod prat purty prate proud pardi pardy pared pirouette pardie pyrite purity purred pardah parade pardee paired period pirate periti pretty yperite
carrot parrot pierrot rot roto roti rote rota root riot barret groat garrote garote carroty terret torot trout worrit cheroot droit wrote forrit rout grot lirot ferret grout parroty heriot cowrote griot rewrote tarot garret territ trot turret chariot sheroot
parry parr par pear sparrow spare spar purr perry pareu pariah pareo pare parae para pair sparry