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.
papal papally pipal pupal papula papule papilla papulae papillae pupil peepul people popple peppily
papal pal chapel tepal spall spail repeal pipal nopal appeal opal maple lapel keypal copal haply appal pale pial pail peal pawl paly pall appall pupal sepal spale tapalo typal cheaply
papa papaw pap pappi pappy pawpaw