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.
pullup pulp pulpy pileup palp plop palpi polyp palapa polypi
pullup loup fillip collop gallop lollop pileup dollop wallop chalupa shallop
pull pulley pul pall pallia pally pill pillow pillowy poll pollee pula pule puli