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.
clammer clammier claimer clamber calmer clamor clamour climber glummer calamar clumber glimmer gleamer calamari calamary claymore gleamier glamor glamour glomera gloomier qualmier columbary columbaria
clammer slammer slummer flummery lamer limmer loamier blamer flamer flamier lamber glummer clamber calmer clammier gleamer gleamier glimmer palmer plummier claimer plummer slimmer slummier