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.
pupal papal pipal pupil papally pepla papula papule peepul people popple papilla papulae peppily papillae
pupal pal tepal duple spale sepal pupil papal peal pipal opal pale pall paly pawl nopal pail appal appall appeal copal couple cupel keypal pial repeal spail spall tapalo typal