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.
crumbs crambos crambes corymbs curiums corms crams crummies cramboes corymbose crimes caroms corymbous grumes creams cremes grumose grumous carroms cormous quorums cramoisy gorms grams cramoisie kermis kormas karmas grimes gramas grooms kermes grammas grammes kermess kirmess gouramis gremmies kermesse
crumbs brumes yttriums durums serums marimbas quorums rums arums aurums bariums bohriums rumbas forums ferrums jorums corymbs crambes crambos curiums grumes larums ceriums drums traumas choriambs
crumb crumby crummie crummy corm cram crambe crambo creme crime grum grume scrum