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.
gripped griped groped cropped crapped grouped gript carped craped creped creeped groupoid carpet
gripped ripped dripped tripped griped trippet rapped propped trapped crapped cirripede cirriped rewrapped prepped frapped bewrapped wrapped riped repped cropped dropped chirped
grippe grippy grip grappa gripe gripey gripy