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.
purity purty parity party pyrite pretty periti yperite parroty prat port pert part pardi pardy pride perdy peart pried prate purda pruta purdah protea purred poured pirate parody parrot pureed protei prutah pardie perdie period parodoi parried 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
puri pur pariah peri pour pure puree purr spur spurrey spurry