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.
diploe dipole duple dapple deploy tipple deeply dopily tapalo topple tupelo duopoly
diploe pole spile ripple popple maypole papule couple hopple fipple cupule apple pule tapalo dipole topple deploy uppile zeppole pale ploy maple dapple supple spale replow nipple people pile plea pele plew plie plow tipple duple tupelo polo wheeple