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.
parity party purity part parroty peart purty pardy pardi parrot periti pyrite parody pretty pardie yperite parried parodoi pert port prat pard perdy pared prate pride pried perdie parade pardah parred period paired protei pardee pirate peridia pierrot proette priedieu
ferity rarity verity purity parity charity lariat fruity hearty verite norite forrit gritty ferrite chariot merit frit krait forty purty borty fritt yperite rewrite surety dirty droit territ trite worrit riot shirty periti cherty bruit party curite parroty griot crit pyrite writ fruit rite barite write heriot carroty burrito cowrite brit ferrety britt arty cerite diorite dorty tarty trait warty grit variety shorty
pariah par sparrow spare spar puri peri pear parr parry pareu pareo pare parae para pair sparry