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.
whiffet whiffed wifed wifty waffed waifed whoofed weft waft wight wived waived waught weight woofed weighed weighty
whiffet biffed buffet effete haffet coiffed miffed riffed taffeta tiffed tuffet whiffed fet