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.
crimes cremes grimes crambes curiums crams corms crummies cramboes crumbs kermes creams caroms grumes carroms crambos kermess cormous grammes kirmess corymbs grimace gremmies cramoisy kermesse gorms grams gouramies corymbous cramoisie corymbose gramas grooms karmas kermis kormas grammas grumose grumous quorums gouramis
berimes rimes crimes grimes primes rhymes kermes armies arames brumbies brims premies berhymes gouramies rims bromes crummies crambes rummies firms curiums prims ceriums trims chirms ramees brumes ramies preemies kirmess kermess grumes grammes bohriums gremmies bermes biremes romeos frames roomies bariums cremes vermes formes primas primos primus surimis yttriums chromes
crime corium corm cram crambe crambo creme crumb crumby crummie crummy curium grim grime grimy scrim