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.
grummer grimmer crummier crammer crimmer crumber grammar grimier groomer krimmer crumbier creamer gramary creamery creamier
rummer grummer drummer rammer rammier rimmer rummier brimmer crammer crimmer crumber crummier grimmer krimmer primmer trimmer
grum crummie crummy gramma gramme gremmie gremmy grume