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.
calmer claimer clamber clammer climber clumber calamar calamari qualmier calamary clammier clamor gleamer glimmer glomera glummer clamour claymore gleamier gloomier glamor glamour
filmer calmer palmer clamber blamer clammier clumber limmer limier limber lamer flamier glummer malmier glomera balmier lamber bloomery plumber plummer polymer slimier slumber slummier gleamier claimer loamier qualmier slimmer plumier plummier clammer palmier climber lumber elmier palmar slammer gloomier slummer glimmer gleamer filmier bloomier fulmar bloomer haulmier flummery flamer telomere
calm calami clam clammy climb clime clomb culm kalmia