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.
peartly partly pertly portly parietal prettily portal protyl prattle predial pretell proudly peridial praedial
partly peartly tartly heartily rattly artal artel artily aureately hardly dirtily hartal irately pertly courtly curtly greatly lyrately portly dartle tartily cartel seriately shortly
peart part pert parity party periti apart speared