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.
purities parities pyrites parties yperites pretties parietes prides prates priedieus proteas pirates peritus protease pyritous proettes proteose parodies parts ports prats prudes purdas pirouettes periods perdues parades purdahs parrots paradise pierrots pards prods perdus
ferities rarities charities parities purities verities forties pyrites rites cerites neuritis muriates variates reties iritis pretties cowrites parties sureties dirties ferrites verites varieties norites barites curites yperites writes rewrites frites seriates hearties sorties diorites treaties sorites shorties
purity parity periti purty pyrite sprit sprite spurt