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.
whippet whipped whipt whapped whopped whupped wipeout wiped wapped wheeped whooped wept wapiti
sippet tippet whippet shipped hipped quipped lappet lipped moppet nipped zipped pipet poppet ripped puppet sipped dipped tipped pipped tappet whipped kipped gipped chipped yipped pet