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.
crumbier crumber crummier creamier crammer creamer crimmer grimier grummer creamery grimmer groomer krimmer
crumbier crumber wormier dreamier premiere premier grimier crummier creamier rammier germier broomier barmier rummier roomier rimier chromier
crumb crumby crambe crambo crummie crummy scrum