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.
clamber climber clumber claimer clammer clammier calmer clamor calamar gleamer clamour calamari gleamier claymore calamary columbary glamor columbaria glamour glimmer glomera glummer gloomier qualmier
clamber lamber slumber plumbery palmer gleamer lambier lamer limber limbier loamier lumber blamer flamer flamier calmer claimer clammer climber clumber gleamier plumber slammer slumbery
clam calami claim clammy climb clomb