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.
crampy cramp crimpy crimp crump gramp grampa grumpy grump
trampy crampy ramp frumpy cramp crimpy gramp grampa grumpy preamp tramp shrimpy
cram crambo crambe gramme caramba corm cream creamy creme crime crumb crummie crummy gram grama gramma crumby scram