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.
cloddier cloudier clowder colder caldera gladier clouter gladder collider coleader colluder golder glider colter guilder clatter glitter cloture clutter gloater coulter caldaria clattery cluttery collator gleetier glittery guiltier killdeer gauleiter kelter kilter
cloddier ladder leadier bladder bladdery bloodier cloudier gladder gladier moldier mouldier plodder sledder soldier soldiery wieldier
cloddy clod claddagh cloud cloudy