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.
crummies gremmies crimes grumes crumbs cremes crambes curiums grammes cramboes cramoisy crams corms cramoisie gouramies caroms kermes grimes creams kermis carroms grumous grumose corymbs crambos kermess kirmess cormous grammas quorums kermesse gouramis corymbose corymbous gorms grams gramas grooms karmas kormas
rummies crummies gremmies ramies roomies armies brumbies gouramies grammes preemies premies
crummie crummy crumb crumby scrum