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.
clamor clamour claymore glamor clammer glamour clamber claimer calamar clammier calamari calamary calmer climber clumber gleamer gleamier columbary columbaria glimmer glummer gloomier qualmier
clamor glamor lamer blamer flamer calamar clamour claymore glamour gleamer
clam clammy calami calm claim climb clime clomb culm glam