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.
crummier crumbier crammer crimmer crumber grummer creamier creamer grimier grimmer krimmer creamery grammar groomer
rummier rammier crummier wormier drummer primmer premier grummer grimier rammer rimier rimmer roomier rummer barmier brimmer broomier grimmer germier krimmer crammer premiere creamier dreamier crimmer trimmer crumbier chromier
crummie crummy crumb crumby scrum