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.
puerpera puerperae puerperia purpura proper propria purpure hyperpure prepare
puerpera raper chirpier warper riper roper harper carper corpora griper groper larruper proper puerperae puerperia purpura dorper draper chirper sharper