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.
calamari calamar calamary calmer clamor clamour columbaria clammer claimer clamber clammier claymore columbary glamor climber clumber glamour gleamer gleamier qualmier
calamari calamar calamary palmar
calami calm clam claim clammy kalam